bluuebunny/crossref_metadata_2025_split huggingface dataset:
Combining flagelliform and dragline spider silk motifs to produce tunable synthetic biopolymer fibers
Authors: Teulé Florence , Addison Bennett , Cooper Alyssa R. , Ayon Joel , Henning Robert W. , Benmore Chris J. , Holland Gregory P. , Yarger Jeffery L. , Lewis Randolph V. 
Published: October 2011

AbstractThe two Flag/MaSp 2 silk proteins produced recombinantly were based on the basic consensus repeat of the dragline silk spidroin 2 protein (MaSp 2) from the Nephila clavipes orb weaving spider. However, the proline‐containing pentapeptides juxtaposed to the polyalanine segments resembled those found in the flagelliform silk protein (Flag) composing the web spiral: (GPGGX1GPGGX2)2with X1/X2= A/A or Y/S. Fibers were formed from protein films in aqueous solutions or extruded from resolubilized protein dopes in organic conditions when the Flag motif was (GPGGX1GPGGX2)2with X1/X2= Y/S or A/A, respectively. Post‐fiber processing involved similar drawing ratios (2–2.5×) before or after water‐treatment. Structural (ssNMR and XRD) and morphological (SEM) changes in the fibers were compared to the mechanical properties of the fibers at each step. Nuclear magnetic resonance indicated that the fraction of β‐sheet nanocrystals in the polyalanine regions formed upon extrusion, increased during stretching, and was maximized after water‐treatment. X‐ray diffraction showed that nanocrystallite orientation parallel to the fiber axis increased the ultimate strength and initial stiffness of the fibers. Water furthered nanocrystal orientation and three‐dimensional growth while plasticizing the amorphous regions, thus producing tougher fibers due to increased extensibility. These fibers were highly hygroscopic and had similar internal network organization, thus similar range of mechanical properties that depended on their diameters. The overall structure of the consensus repeat of the silk‐like protein dictated the mechanical properties of the fibers while protein molecular weight limited these same properties. Subtle structural motif re‐design impacted protein self‐assembly mechanisms and requirements for fiber formation. © 2011 Wiley Periodicals, Inc. Biopolymers 97: 418–431, 2012.
Studies on the Biodegradation of Fosfomycin: Synthesis of 13C‐Labeled Intermediates, Feeding Experiments with Rhizobium huakuii PMY1, and Isolation of Labeled Amino Acids from Cell Mass by HPLC
Authors: McGrath John W. , Hammerschmidt Friedrich , Kählig Hanspeter , Wuggenig Frank , Lamprecht Günther , Quinn John P. 
Published: October 2011

AbstractRacemic (1R*,2R*)‐1,2‐dihydroxy‐[1‐13C1]propylphosphonic acid and 1‐hydroxy‐[1‐13C1]acetone were synthesized and fed to R. huakuii PMY1. Alanine and a mixture of valine and methionine were isolated as their N‐acetyl derivatives from the cell hydrolysate by reversed‐phase HPLC and analyzed by NMR spectroscopy. It was found that the carbon atoms of the respective carboxyl groups were highly 13C‐labeled (up to 65 %). Hydroxyacetone is therefore considered an obligatory intermediate of the biodegradation of fosfomycin by R. huakuii PMY1.
Organocatalytic Strategies for the Construction of Optically Active Imidazoles, Oxazoles, and Thiazoles
Authors: Albrecht Łukasz , Ransborg Lars Krogager , Albrecht Anna , Lykke Lennart , Jørgensen Karl Anker 
Published: October 2011

AbstractThis study demonstrates the first enantioselective synthesis of hydroxyalkyl‐ and aminoalkyl‐substituted imidazoles, oxazoles, and thiazoles. The approach developed utilizes a highly effective one‐pot reaction cascade that consists of either an organocatalytic epoxidation or aziridination of α,β‐unsaturated aldehydes coupled with a [3+2]‐annulation, in which amidines, ureas, or thioureas act as effective 1,3‐dinucleophilic species. The methodology described benefits from low catalyst loadings, commercially and readily available starting materials, and mild reaction conditions.
ChemInform Abstract: Structural Investigation of a Fully Ordered closo‐Ge2‐9 Cluster in the Compound [K+(2,2,2‐crypt)]2Ge2‐9.
Authors: Akerstedt Josefin , Ponou Simeon , Kloo Lars , Lidin Sven 
Published: October 2011

AbstractSingle crystals of the title compound are isolated from a solution of K4Ge9 and 2,2,2‐crypt in en at room temperature.
ChemInform Abstract: Preparation and Visible Light Photocatalytic Activity of Bi2O3/Bi2WO6 Heterojunction Photocatalysts.
Authors: Gui Ming‐Sheng , Zhang Wei‐De , Su Qing‐Xi , Chen Cai‐Hong 
Published: October 2011

AbstractBi2WO6 is obtained solvothermally from Bi(NO3)3, Na2WO4, ethylene glycol, EtOH, formaldehyde, and urea (autoclave, 160 °C, 12 h).
ChemInform Abstract: Exploring the Structure and Properties of Transition Metal Templated {VM17(VO4)2} Dawson‐Like Capsules.
Authors: Miras Haralampos N. , Stone Daniel , Long De‐Liang , McInnes Eric J. L. , Koegerler Paul , Cronin Leroy 
Published: October 2011

AbstractCompounds (III) and (V) are characterized by cyclic voltammetry, EPR, UV/VIS, and IR spectroscopy, cryospray ionization mass spectrometry, XRD, magnetic measurements, and DFT calculations.
ChemInform Abstract: Synthesis and Electronic Properties of LnRhAsO and LnIrAsO Compositions.
Authors: Muir Sean , Sleight A. W. , Subramanian M. A. 
Published: October 2011

AbstractLnRhAsO (Ln: Ce, Nd) and LnIrAsO (Ln: La, Ce, Nd) are prepared from mixtures of La2O3, CeO2, or Nd2O3 and elemental Ln, Rh or Ir, and As (1373 K, 12—18 h; annealing at 1173 K for 12 h).
ChemInform Abstract: On the Utility of S‐Mesitylsulfinimines for the Stereoselective Synthesis of Chiral Amines and Aziridines.
Authors: Roe Caroline , Sola Toni Moragas , Sasraku‐Neequaye Leonid , Hobbs Heather , Churcher Ian , MacPherson David , Stockman Robert A. 
Published: October 2011

AbstractThe S‐mesitylsulfinimines are a useful alternative.
ChemInform Abstract: Sequential Combination of Ruthenium‐, Base‐, and Gold‐Catalysis — A New Approach to the Synthesis of Medicinally Important Heterocycles.
Authors: Ramachary Dhevalapally B. , Narayana Vidadala V. 
Published: October 2011

AbstractThe novel method for the synthesis of 2‐[(Z)‐butadienyl]phenylamines, quinolines, phenanthridines, and azepines involves ring‐closing metathesis, base‐induced ring opening, intra‐ and intermolecular hydroamination and [4 + 2] cycloaddition reactions.
ChemInform Abstract: Zinc—Zinc Bonded Decamethyldizincocene Zn2(η5—C5Me5)2 as Catalyst for the Inter‐ and Intramolecular Hydroamination Reaction.
Authors: Luehl Anja , Nayek Hari Pada , Blechert Siegfried , Roesky Peter W. 
Published: October 2011

AbstractVarious examples of intermolecular as well as intramolecular hydroaminations promoted by the title catalyst are presented.
ChemInform Abstract: X=Y—ZH Compounds as Potential 1,3‐Dipoles. Part 65. Atom Economic Cascade Synthesis of Highly Functionalized Pyrimidinylpyrrolidines.
Authors: Elboray Elghareeb E. , Grigg Ronald , Fishwick Colin W. G. , Kilner Colin , Sarker Mohammed A. B. , Aly Moustafa F. , Abbas‐Temirek Hussien H. 
Published: October 2011

AbstractCycloaddition of pyrimidine aldehyde (I) with primary amines and a dipolarophile proceeds smoothly in hot toluene providing the appropriate cycloadducts in good yields.
ChemInform Abstract: Rhodium‐Catalyzed Addition of α‐Keto Acid Chlorides with Terminal Alkynes.
Authors: Kashiwabara Taigo , Tanaka Masato 
Published: October 2011

AbstractThe title reaction affords γ‐chloro‐α‐oxo‐β,γ‐unsaturated ketones with excellent regio‐ and (Z)‐stereoselectivity.
ChemInform Abstract: Iron(0), Rhodium(I) and Palladium(II) Complexes with p‐(N,N‐Dimethylaminophenyl)diphenylphosphine and the Application of the Palladium Complex as a Catalyst for the Suzuki—Miyaura Cross‐Coupling Reaction.
Authors: Sarmah Chandan , Borah Malabika , Das Pankaj 
Published: October 2011

AbstractThe new PAC is used as a highly active catalyst for the cross‐coupling reaction of aryl bromides with arylboronic acids.
ChemInform Abstract: A Suzuki‐Type Cross‐Coupling Reaction of Arylacetylene Halides with Arylboronic Acids.
Authors: Shi Yu , Li Xiaoyu , Liu Jianhui , Jiang Wenfeng , Sun Licheng 
Published: October 2011

AbstractThe reaction is applicable to various arylalkynyl iodides and arylboronic acids including sterically demanding substrates.
ChemInform Abstract: One‐Pot Production of Chiral α,β‐Epoxy Ketones from Benzaldehydes and Acetophenones by Recyclable Poly(amino acid) Catalysis.
Authors: Luo Wanrong , Yu Zhichao , Qiu Wenwei , Yang Fan , Liu Xiaofeng , Tang Jie 
Published: October 2011

AbstractFor the title reaction two effective reaction systems with complementary high enantioselectivities and yields are developed.
ChemInform Abstract: Reaction of [60]Fullerene with Epoxides under Photoirradiation: Synthesis of C60‐Fused Tetrahydrofuran Derivatives.
Authors: Miao Chun‐Bao , Tian Zong‐Yong , Ruan Xiao‐Jiao , Sun Xiao‐Qiang , Yang Hai‐Tao 
Published: October 2011

AbstractThe cis‐isomer (III) is the unexpected major product while in the thermal reaction only the cis‐product can be obtained.
ChemInform Abstract: Gold(I)‐Catalyzed Tandem Alkoxylation/Lactonization of γ‐Hydroxy‐α,β‐acetylenic Esters.
Authors: Ramon Ruben S. , Pottier Christophe , Gomez‐Suarez Adrian , Nolan Steven P. 
Published: October 2011

AbstractWith respect to the lactonization step, the catalyst is more efficient than digold or gold‐nitrile complexes.
ChemInform Abstract: A Synthetic Route to α‐Substituted Butenolides: Enantioselective Synthesis of (+)‐Ancepsenolide.
Authors: Ghobril Cynthia , Kister Jeremy , Baati Rachid 
Published: October 2011

AbstractA variety of carboxylic acids and tetronic acid are transformed by a new four‐step procedure to the title butenolides.
ChemInform Abstract: Diastereoselective Synthesis of Bicyclo[2.2.2]octan‐2‐one Derivatives Through an Unexpected Organocatalytic Tandem Michael—Michael Reaction.
Authors: Yang Juanjuan , Huang Huicai , Jin Zhichao , Wu Wenbin , Ye Jinxing 
Published: October 2011

AbstractThe process is highly diastereoselective and produces polycyclic heterocycles in the presence of a bifunctional thiourea catalyst.
ChemInform Abstract: Palladium‐Catalyzed Direct Monoarylation of Bithiophenyl Derivatives or Bis(thiophen‐2‐yl)methanone with Aryl Bromides.
Authors: Larbi Karima Si , Djebbar Safia , Doucet Henri 
Published: October 2011

AbstractDirect arylation of bis(thiophenyl) (I) and its derivatives with aryl bromides is catalyzed by an air‐stable Pd‐catalyst in low amounts (1 mol% Pd).
ChemInform Abstract: Enantioselective Friedel—Crafts Aminoalkylation Catalyzed by Chiral Ammonium 1,1′‐Binaphthyl‐2,2′‐disulfonates.
Authors: Hatano Manabu , Sugiura Yoshihiro , Akakura Matsujiro , Ishihara Kazuaki 
Published: October 2011

AbstractThe system BNS/Me2N‐Bu is found to optimal for the preparation of the required chiral building blocks.
ChemInform Abstract: A Novel Catalyst‐Free Tandem Reaction for the Synthesis of 5‐Hydroxy‐1,5‐dihydro‐2H‐pyrrol‐2‐ones in Water Medium.
Authors: Wu Ming‐Yu , Li Kun , Wang Na , He Ting , Yu Xiao‐Qi 
Published: October 2011

AbstractThe simple and environmentally friendly protocol allows the synthesis of fully functionalized title compounds as subunits of biologically active natural products.
ChemInform Abstract: N‐Heterocyclic Carbene Catalyzed Cyclization Cascades of 3‐Halopropenals and Arylnitroso Compounds to 2,3‐Disubstituted Isoxazol‐5(2H)‐ones.
Authors: Yao Weijun , Bian Ming , Wang Gang , Ma Cheng 
Published: October 2011

AbstractThe process renders possible a metal‐free approach to a broad spectrum of isoxazole derivatives.
ChemInform Abstract: An Effective Nitrilimine Cycloaddition for the Synthesis of 1,3,5‐Trisubstituted 1,2,4‐Triazoles from Oximes with Hydrazonoyl Hydrochlorides.
Authors: Wang Li‐Ya , Tseng Wen‐Che , Lin Hui‐Yi , Wong Fung Fuh 
Published: October 2011

AbstractThe process can be applied to various types of oximes to form the biologically important triazole scaffold with generally good yields.
ChemInform Abstract: The Choice of Lewis Acids for the Prins Reaction: Two Total Syntheses of (.+‐.)‐Civet.
Authors: Dobbs Andrian P. , et al. et al. 
Published: October 2011

AbstractPrins cyclization of homoallylic alcohols and two new modifications as triflate‐trapping and Mukaiyama‐aldol‐silyl Prins reactions are developed using the proper choice of the Lewis acids.
ChemInform Abstract: 2,6‐Disubstituted Tetrahydropyrans by Domino Meyer—Schuster Rearrangement—Hetero‐Michael Addition of 6‐Alkyne‐1,5‐diols.
Authors: Wohland Max , Maier Martin E. 
Published: October 2011

AbstractVarious diol substrates are prepared starting from pentanediol.
ChemInform Abstract: An Improved Procedure for the Synthesis of 3,4‐Ethylenedioxythiophene.
Authors: Zhang Hua , Qian Chao , Chen Xin‐Zhi 
Published: October 2011

AbstractA more effective and more suitable method for the large‐scale production of the title compound (VIII), the monomer for the synthesis of the promising polymer poly(3,4‐ethylenedioxythiophene), is developed.
ChemInform Abstract: 2‐Phenylimidazo[1,2‐b]pyridazine Derivatives Highly Active Against Haemonchus contortus.
Authors: Ali Abdelselam , Cablewski Teresa , Francis Craig L. , Ganguly Ashit K. , Sargent Roger M. , Sawutz David G. , Winzenberg Kevin N. 
Published: October 2011

AbstractA variety of the title imidazopyridazine derivatives are synthesized and evaluated for their in vitro anthelmintic activity.
ChemInform Abstract: A Convenient Synthesis of 1,3‐Disubstituted 4‐Thioxo‐3,4‐dihydropyrido[2,3‐d]pyrimidin‐2(1H)‐ones and 4‐Thioxo‐3,4‐dihydropyrido[4,3‐d]pyrimidin‐2(1H)‐ones.
Authors: Kobayashi Kazuhiro , Komatsu Toshihide , Yokoi Yuki , Konishi Hisatoshi 
Published: October 2011

AbstractAn efficient and simple method for the synthesis of the compounds (V) and (IX) starting from the readily available starting materials (I) and (VI) is presented.
ChemInform Abstract: Nano Copper Oxide Catalyzed Synthesis of Symmetrical Diaryl Selenides via Cascade Reaction of KSeCN with Aryl Halides.
Authors: Reddy K. Harsha Vardhan , Reddy V. Prakash , Madhav B. , Shankar J. , Nageswar Y. V. D. 
Published: October 2011

AbstractThe protocol renders possible the synthesis of a broad spectrum of diorganyl selenides as potential drug candidates under ligand‐free conditions where the aryl iodides are the most efficient substrates.
ChemInform Abstract: Zn in Ionic Liquid: An Efficient Reaction Media for the Synthesis of Diorganyl Chalcogenides and Chalcogenoesters.
Authors: Narayanaperumal Senthil , Alberto Eduardo E. , Gul Kashif , Kawasoko Cristiane Yuriko , Dornelles Luciano , Rodrigues Oscar E. D. , Braga Antonio Luiz 
Published: October 2011

AbstractThe synthesis of diorganyl sulfides or selenides and thio‐ or selenoesters is based on the cleavage of diorganyl disulfides and diselenides by zinc dust under neutral conditions in short reaction times (2‐40 min) at room temperature in the presence of aryl/alkyl halogenides or acyl chlorides, correspondingly.
ChemInform Abstract: gem‐Dimethyl‐Bearing C‐Glucosides (I) as Sodium‐Glucose Co‐Transporter 2 (SGLT2) Inhibitors
Authors: Shi Yongheng , Zhao Guilong , Lou Yuanyuan , Wang Yuli , Shao Hua , Liu Wei , Xu Weiren , Tang Lida 
Published: October 2011

Abstractdesign, synthesis and anti‐hyperglycemic activities
ChemInform Abstract: Antifungal Quinazolinones from Marine‐Derived Bacillus cereus and Their Preparation.
Authors: Xu Zhihong , Zhang Yapeng , Fu Haichao , Zhong Huimin , Hong Kui , Zhu Weiming 
Published: October 2011

AbstractThe novel quinazolinone alkaloids (I) and (II) are isolated along with seven known analogues from the BuOH extract of the marine‐derived bacterium Bacillus cereus.
Effect of orientation on the microstructure of nickel‐based crystalline superalloys
Authors: Zhao X. B. , Liu L. , Gao S. F. , Ge B. M. , Zhang J. , Li Y. L. , Fu H. Z. 
Published: October 2011

AbstractThe effect of crystal orientation on the microstructure of a nickel‐based crystalline superalloys during directional solidification was explored. Differently oriented crystals with [001] and [011] orientations were fabricated with seeding technique. The results showed that primary dendrite arm spacings decreased simultaneously with the increase of misroientation. The primary dendrites arrange in lines in [011] single crystal. For [001] oriented crystals, the size of γ′ phase increased with the increasing of misorientation. However, it was observed that the size of γ′ decreased with large misorientation for [011] orientated growth. Meanwhile, more γ′ in [011] crystals tended to be triangular. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Prediction of gas chromatographic retention indices of some amino acids and carboxylic acids from their structural descriptors
Authors: Fatemi Mohammad Hossein , Elyasi Maryam 
Published: October 2011

AbstractIn this work, quantitative structure‐retention relationship (QSRR) approaches were applied for modeling and prediction of the retention index of 282 amino acids (AAs) and carboxylic acids (CAs). Descriptors that were used to encode structural features of molecules in a data set were calculated by using the Dragon software. The genetic algorithm (GA) and stepwise multiple linear regression (MLR) methods were used to select the most relevant descriptors. Then support vector machine (SVM), artificial neural network (ANN) and multiple linear regression were utilized to construct nonlinear and linear quantitative structure‐retention relationship models. The obtained results using these techniques revealed that nonlinear models were much better than other linear ones. The GA‐ANN model has the average absolute relative errors (AARE) of 0.054, 0.059 and 0.100 for training, internal and external test set. Applying the tenfold cross‐validation procedure on GA‐AAN model obtained the statistics of Q2=0.943, which revealed the reliability of this model.
Revealing Model Dependencies in “Assessing the RAFT Equilibrium Constant via Model Systems: An EPR Study”
Authors: Junkers Tanja , Barner‐Kowollik Christopher , Coote Michelle L. 
Published: October 2011

AbstractIn a recent article (W. Meiser, M. Buback, Assessing the RAFT Equilibrium Constant via Model Systems: An EPR Study, Macromol. Rapid Commun. 2011, 18, 1490‐1494), it is claimed that evidence is found that unequivocally proves that quantum mechanical calculations assessing the equilibrium constant and fragmentation rate coefficients in dithiobenzoate‐mediated reversible addition fragmentation transfer (RAFT) systems are beset with a considerable uncertainty. In the present work, we show that these claims made by Meiser and Buback are beset with a model dependency, as a critical key parameter in their data analysis – the addition rate coefficient of the radicals attacking the C=S double bond in the dithiobenzoate – induces a model insensitivity into the data analysis. Contrary to the claims made by Meiser and Buback, their experimental results can be brought into agreement with the quantum chemical calculations if a lower addition rate coefficient of cyanoisopropyl radicals (CIP) to the CIP dithiobenzoate (CPDB) is assumed. To resolve the model dependency, the addition rate coefficient of CIP radicals to CPDB needs to be determined as a matter of priority.
Hochmobile Echtzeit‐THz‐Zeitbereichsspektroskopie
Authors: Laman Norman 
Published: October 2011

AbstractZahlreiche Terahertzanwendungen wurden erfolgreich im Labormaßstab entwickelt. Im Praxiseinsatz herrschen jedoch andere, weniger kontrollierbare Umgebungseinflüsse vor als im Labor. Kompakte, integrierte Terahertzspektrometer sind flexibel einsetzbar, sodass sie für Vor‐Ort‐Analysen eingesetzt werden können. Außerdem erlauben sie Echtzeitanalysen und erweitern so das Einsatzspektrum kommerzieller Produkte.
Life quality and experience among long‐term survivors of brittle type 1 diabetes mellitus
Authors: Cartwright A , Wallymahmed M , MacFarlane IA , Williams G , Gill GV 
Published: October 2011

AbstractSeverely unstable, or ‘brittle’, type 1 diabetes is characterised by recurrent admissions, usually in diabetic ketoacidosis and life disruption. It is associated with excess mortality and increased risk of diabetic complications. The long‐term social and life effects of survivors have not, however, been previously explored.The aim of our study was to determine the long‐term effects of a period of brittle control on life quality and psychosocial morbidity.We identified 10 survivors of an original cohort of 33 brittle type 1 patients, recruited between 1979 and 1985. All were visited by a diabetes research nurse, and a semi‐quantitative interview was conducted, and quantitative quality of life (QOL) assessment made. QOL data were compared with a case‐control group (two controls per case) matched for age, sex and diabetes duration; but without a history of brittle control.All of the 10 survivors were female; mean age was 42±4 years and diabetes duration 32±5 years. The mean period of follow up was 22 years. Four (40%) had active psychiatric disease (two depression, one depression and schizophrenia, and one eating disorder). Most attributed their previous instability to life stresses and/or inadequate diabetes‐related education. Two (20%) admitted to inducing dysglycaemia by therapeutic interference. Five were in a stable relationship and three had children. None of the survivors was actively brittle, and most attributed resolution of brittleness to positive life changes. Total QOL score was lower (i.e. worse) in the brittle compared with the stable group (p=0.046).We conclude that survivors of brittle type 1 diabetes have significant psychosocial morbidity and reduced life quality. This emphasises the adverse long‐term effects of brittle diabetes, even when glycaemic stability has been restored. Copyright © 2011 John Wiley & Sons.
Rare disorders presenting in the diabetic clinic: an example using audit of the NSCT adult Alström clinics
Authors: Paisey RB , Barrett T , Carey CM , Hiwot T , Cramb R , White A , Seymour R , Bunce S , Waterson M , Rockett C , Vogler K , Williams K , Parkinson K , Kenny T 
Published: October 2011

AbstractAlström syndrome, a rare autosomal recessive ciliopathy (OMIM 203800), is classically diagnosed on the basis of childhood onset cone rod retinal dystrophy, sensorineural hearing loss and obesity with severe insulin resistance. In addition, in infancy acute reversible cardiomyopathy occurs in 30% of cases, and type 2 diabetes develops in most cases in young adulthood.We describe the audit of 11 cases of Alström syndrome diagnosed as adults, eight in the context of diabetes clinics who were referred to the National Specialised Commissioning Team (NSCT) adult Alström clinic at Torbay Hospital. All have severe insulin resistance, dyslipidaemia and a variable degree of cardiac, renal and musculoskeletal involvement – features not associated with a unifying diagnosis until referred to their local diabetic clinics in eight of them.Obesity and young onset type 2 diabetes are increasing and it is important to be aware that some cases will have associated rare recessive conditions such as Alström syndrome, Wolfram syndrome, lipodystrophies, Bardet Biedl syndrome (LMBBS), Prader Willi syndrome or occult cystic fibrosis. Early recognition of Alström families will facilitate prompt recognition and treatment of comorbidities and genetic counselling. Copyright © 2011 John Wiley & Sons.
LiLa5Si4N10O and LiPr5Si4N10O – Chain‐Type Oxonitridosilicates
Authors: Lupart Saskia , Schnick Wolfgang 
Published: October 2011

AbstractThe isotypic lithium rare‐earth oxonitridosilicates LiLn5Si4N10O (Ln = La, Pr) were synthesized at temperatures of 1200 °C in weld shut tantalum ampoules employing liquid lithium as flux. Thereby, a silicate substructure with a low degree of condensation was obtained. LiLa5Si4N10O crystallizes in space group P$\bar{1}$ [Z = 1, LiLa5Si4N10O: a = 5.7462(11), b = 6.5620(13), c = 8.3732(17) Å, α = 103.54(3), β = 107.77(3), γ = 94.30(3), wR2 = 0.0405, 1315 data, 96 parameters]. The nitridosilicate substructure consists of loop branched dreier single‐chains of vertex sharing SiN4 tetrahedra. Lattice energy calculations (MAPLE) and EDX measurements confirmed the electrostatic bonding interactions and the chemical compositions. The 7Li solid‐state MAS NMR investigation is reported.