bluuebunny/crossref_metadata_2025_split huggingface dataset:
ChemInform Abstract: Palladium‐Catalyzed Cross Addition of Terminal Alkynes to Aryl Ynamides: An Unusual trans‐Hydroalkynylation Reaction.
Authors: Liu Ge , Kong Wei , Che Jianwei , Zhu Gangguo 
Published: April 2015

AbstractThe Pd catalyzed trans‐hydroalkynylation of N‐sulfonyl ynamides gives α‐alkynylation products in high yields with excellent regio‐ and stereoselectivities.
ChemInform Abstract: Hypoiodite‐Mediated Catalytic Cyclopropanation of Alkenes with Malononitrile.
Authors: Yoshimura Akira , Jones T. Nicholas , Yusubov Mekhman S. , Zhdankin Viktor V. 
Published: April 2015

AbstractHypoiodite species are generated from catalytic amounts of iodine and the terminal oxidant tBuOOH.
ChemInform Abstract: Palladium‐Catalyzed [2 + 1 + 1] Annulation of Norbornenes with (z)‐Bromostyrenes: Synthesis of Bismethylenecyclobutanes via Twofold C(sp2)—H Bond Activation
Authors: Mao Jiangang , Bao Weiliang 
Published: April 2015

Abstract19 examples
ChemInform Abstract: A Practical Nickel‐Catalyzed Reductive Alkylation of Amidophenyl Bromides.
Authors: Liu Xuge , Yang Zhilin , Li Ya‐Min , Yang Fan , Feng Liang , Wang Nengzhong , Ma Debiao , Chang Kwen‐Jen , Shen Yuehai 
Published: April 2015

AbstractA modified Weix′s reductive coupling of amidoaryl bromides and octyl bromide is developed to give products (III) in moderate to good yields.
ChemInform Abstract: Chlorination of Benzylic and Allylic Alcohols with Trimethylsilyl Chloride Enhanced by Natural Sodium Montmorillonite.
Authors: Tandiary Michael Andreas , Masui Yoichi , Onaka Makoto 
Published: April 2015

AbstractThe practical method allows the chlorination of primary, secondary, and tertiary benzylic and allylic alcohols and can be scaled up.
ChemInform Abstract: N‐Heterocyclic Carbene Organocatalytic Reductive β,β‐Coupling Reactions of Nitroalkenes via Radical Intermediates.
Authors: Du Yu , Wang Yuhuang , Li Xin , Shao Yaling , Li Guohui , Webster Richard D. , Chi Yonggui Robin 
Published: April 2015

AbstractThe coupling of nitroalkenes in the presence of a NHC‐catalyst and aldehydes as reducing agents provides dl‐diastereomers (II) and (VII) as major products.
ChemInform Abstract: Biscarboxy‐Functionalized Imidazole and Palladium as Highly Active Catalytic System in Protic Solvents: Methanol and Water.
Authors: Martinez Regina , Pastor Isidro M. , Yus Miguel 
Published: April 2015

Abstract1,3‐Bis(carboxymethyl)imidazole BCI is used as ligand in the Pd‐catalyzed cross‐coupling between aryl bromides and arylboronic acids, potassium aryl trifluoroboronates or cinnamylboronic acid
ChemInform Abstract: Ruthenium(II)‐Catalyzed Oxidative C—H Alkenylations of Sulfonic Acids, Sulfonyl Chlorides and Sulfonamides.
Authors: Ma Wenbo , Mei Ruhuai , Tenti Giammarco , Ackermann Lutz 
Published: April 2015

AbstractThe catalytic efficacy of the ruthenium catalyst in the cross‐dehydrogenative alkenylation of sulfonic acid derivatives is significantly improved by the addition of co‐catalytic amounts of AgSbF6.
ChemInform Abstract: Gold‐Catalyzed Carboalkoxylations of 2‐Ethynylbenzyl Ethers to Form 1‐ and 3‐Substituted 2‐Methoxy‐1‐H‐indenes: Broensted Acids versus Gold Catalysis.
Authors: Chen Chun‐Hao , Wang Chiou‐Dong , Hsieh Yi‐Feng , Liu Rai‐Shung 
Published: April 2015

AbstractOptimized conditions to obtain 1‐ or 3‐aryl‐2‐methoxyindenes (II) and (IV), resp., from intramolecular carboalkoxylation reactions of 2‐ethynylbenzyl ethers (I) are established.
ChemInform Abstract: Molybdenum(VI) Dioxo Complexes for the Epoxidation of Allylic Alcohols and Olefins.
Authors: Pandhare Swati L. , Jadhao Rajesh R. , Puranik Vedavati G. , Joshi Pranaya V. , Capet Frederic , Dongare Mohan K. , Umbarkar Shubhangi B. , Michon Christophe , Agbossou‐Niedercorn Francine 
Published: April 2015

AbstractA newly synthesized molybdenum(VI) dioxo complex is used as a catalyst for the epoxidation of allylic alcohols and olefins.
ChemInform Abstract: A Phosphine‐Catalyzed Regioselective [3 + 2] Cycloaddition of Ethyl 5,5‐Diarylpenta‐2,3,4‐trienoate with Aromatic Aldehydes and α,β‐Unsaturated Carbonyl Compounds.
Authors: Wang Lu‐Feng , Cao Xiao‐Ping , Shi Zi‐Fa , An Peng , Chow Hak‐Fun 
Published: April 2015

AbstractA series of methylidene substituted 2,5‐dihydrofurans is prepared via the reaction of ethyl 5,5‐diphenylpenta‐2,3,4‐trienoate (I) with aryl or hetaryl aldehydes.
ChemInform Abstract: A Mild Approach for the Synthesis of Indoles from N‐(2‐Iodo‐aryl)formamides and Phenylacetylene by a Copper(I)‐ and Palladium‐Catalyzed Cascade Process.
Authors: Ahmed Atiur , Ghosh Munmun , Dhara Shubhendu , Ray Jayanta K. 
Published: April 2015

AbstractThe reaction yields decrease with an increasing electron‐withdrawing effect of the substituents.
ChemInform Abstract: A General Diversified Synthesis of Carbazoles and the First Synthesis of Karapinchamine A.
Authors: Qiu Youai , Zhou Jing , Fu Chunling , Ma Shengming 
Published: April 2015

AbstractThe synthetic potential of this Au‐catalyzed propargylic alcohol cyclization reaction is demonstrated in the first synthesis of karapinchamine A (IX).
ChemInform Abstract: Aerobic Photooxidative Synthesis of Benzimidazoles from Aromatic Aldehydes and Diamines Using Catalytic Amounts of Magnesium Iodide.
Authors: Nagasawa Yoshitomo , Matsusaki Yoko , Hotta Toshiyuki , Nobuta Tomoya , Tada Norihiro , Miura Tsuyoshi , Itoh Akichika 
Published: April 2015

AbstractThe one‐pot synthesis of benzimidazole also succeeds starting from benzyl alcohol instead of benzaldehyde.
ChemInform Abstract: Copper‐Catalyzed Intramolecular O‐Arylation: A Simple and Efficient Method for Benzoxazole Synthesis.
Authors: Wu Fengtian , Zhang Jie , Wei Qianbing , Liu Ping , Xie Jianwei , Jiang Haojie , Dai Bin 
Published: April 2015

AbstractA wide range of 2‐substituted benzoxazoles is synthesized from N‐(2‐halophenyl)benzamides including less reactive chloro derivatives via Cu‐catalyzed intramolecular coupling reactions using 2‐methoxybenzoate as the ligand.
ChemInform Abstract: Regioselective Synthesis of β‐Aryl Enaminones and 1,4,5‐Trisubstituted 1,2,3‐Triazoles from Chalcones and Benzyl Azides.
Authors: Xie Yu‐Yang , Wang Ying‐Chun , Qu Hong‐En , Tan Xian‐Chun , Wang Heng‐Shan , Pan Ying‐Ming 
Published: April 2015

AbstractDepending on the solvent used, the efficient synthesis of either β‐aryl enaminones (DMF) or 1,4,5‐trisubstituted 1,2,3‐triazoles (toluene) succeeds in a highly regioselective manner.
ChemInform Abstract: Acyloxyphosphonium versus Aminophosphonium Intermediates: Application to the Synthesis of N‐Acylbenzotriazoles.
Authors: Duangkamol Chuthamat , Wangngae Sirilak , Pattarawarapan Mookda , Phakhodee Wong 
Published: April 2015

AbstractVarious title compounds are available from aromatic and aliphatic carboxylic acids.
ChemInform Abstract: Synthesis of 4‐(1H‐1,2,3‐Triazol‐4‐yl)‐1,3‐thiazole‐2‐amine Derivatives.
Authors: Bunev A. S. , Trushkova Yu. O. , Ostapenko G. I. , Statsyuk V. E. , Peregudov A. S. 
Published: April 2015

Abstractusing the Hantzsch reaction
ChemInform Abstract: Tandem Gold Self‐Relay Catalysis for the Synthesis of 2,3‐Dihydropyridin‐4(1H)‐ones: Combination of σ and π Lewis Acid Properties of Gold Salts.
Authors: Fustero Santos , Miro Javier , Sanchez‐Rosello Maria , del Pozo Carlos 
Published: April 2015

AbstractHomopropargyl amides bearing a fluorinated substituent at the quaternary center (syntheses described) are treated according to A).
ChemInform Abstract: One‐Pot Double Benzylation of 2‐Substituted Pyridines Using Palladium‐Catalyzed Decarboxylative Coupling of sp2 and sp3 Carbons.
Authors: Wang Yaping , Li Xinjian , Leng Faqiang , Zhu Helong , Li Jingya , Zou Dapeng , Wu Yangjie , Wu Yusheng 
Published: April 2015

AbstractThe title reaction uses a bimetallic catalytic system consisting of PdCl2 and Ag2O.
ChemInform Abstract: Selective Synthesis of Quinolines and Indoles: Sulfur‐Assisted or Selenium‐Catalyzed Reaction of β‐(2‐Nitrophenyl)‐α,β‐unsaturated Ketones with Carbon Monoxide.
Authors: Umeda Rui , Kouno Hiroshi , Kitagawa Takayuki , Okamoto Tomohiro , Kawashima Keisuke , Mashino Tsukasa , Nishiyama Yutaka 
Published: April 2015

AbstractSulfur‐assisted or Se‐catalyzed reaction of the title α,β‐unsaturated ketones (I) with CO and H2O affords quinolines (II) in moderate to good yield.
ChemInform Abstract: Palladium‐Catalyzed Carbonylative [3 + 2 + 1] Annulation of N‐Aryl‐pyridine‐2‐amines with Internal Alkynes by C—H Activation: Facile Synthesis of 2‐Quinolinones.
Authors: Chen Jianbin , Natte Kishore , Spannenberg Anke , Neumann Helfried , Beller Matthias , Wu Xiao‐Feng 
Published: April 2015

AbstractNotable features of the title process are the use of Mo(CO)6 as CO source, good functional group tolerance, and an easily removable directing group.
ChemInform Abstract: Silver(I)‐Catalyzed Annulation for the Regioselective Synthesis of N‐Imino‐γ‐carbolinium Ylides from Hydrazones of Indole‐3‐carbonyl Derivatives and Propargylic Alcohols.
Authors: Zhu Yu , Shen Xin‐Rui , Tang Hai‐Tao , Lin Min , Zhan Zhuang‐Ping 
Published: April 2015

AbstractThe transformation proceeds via a Friedel—Crafts‐type substitution of a propargylic cationic species, generated from (II) and (V), with indoles followed by intramolecular N—C bond formation.
ChemInform Abstract: Exploring a Unique Reactivity of N‐Heterocyclic Carbenes (NHC) in Rhodium(III)‐Catalyzed Intermolecular C—H Activation/Annulation.
Authors: Ghorai Debasish , Choudhury Joyanta 
Published: April 2015

AbstractImidazolium iodides (I) and (V) react with alkynes to give the corresponding imidazo[1,2‐a]quinolinium triflates.
ChemInform Abstract: Chemoselective Synthesis of 4,5‐Diarylpyrrolo[2,3‐d]pyrimidines (6,7‐Diaryl‐7‐deazapurines) by Consecutive Suzuki and Liebeskind—Srogl Cross‐Couplings.
Authors: Kroemer Matous , Klecka Martin , Slavetinska Lenka , Klepetarova Blanka , Hocek Michal 
Published: April 2015

AbstractSelective monoarylation at position 5 of substrate (I) becomes possible with Suzuki [‐< conditions A)] or Stille coupling [‐< conditions C), product (VIII)].
ChemInform Abstract: An Efficient Catalyst‐Free Synthesis of Novel Benzo[a][1,3]oxazino[6,5‐c]phenazine Derivatives via One Pot Four‐Component Domino Protocol in Water.
Authors: Khanna Garima , Chaudhary Ankita , Khurana Jitender M. 
Published: April 2015

AbstractThe reaction process is ecofriendly and economical.
ChemInform Abstract: Copper(I)‐Catalyzed Oxidative Coupling Between 2‐Aminobenzothiazole and Terminal Alkyne: Formation of Benzothiazine.
Authors: Mitra Shubhanjan , Chakraborty Amrita , Mishra Subhajit , Majee Adinath , Hajra Alakananda 
Published: April 2015

AbstractTransferring the reaction conditions from 2‐aminobenzothiazoles to 2‐aminothiazole fails.
ChemInform Abstract: Optimized Synthesis of Diamino‐Triazinylmethyl Benzoates as Inhibitors of Rad6B Ubiquitin Conjugating Enzyme.
Authors: Kothayer Hend , Morelli Matteo , Brahemi Ghali , Elshanawani Abdalla A. , Abu Kull Mansour E. , El‐Sabbagh Osama I. , Shekhar Malathy P. V. , Westwell Andrew D. 
Published: April 2015

AbstractTwo newly optimized routes to the target compounds (VI) are presented.
ChemInform Abstract: Prenylated Indole Alkaloid Derivatives from Marine Sediment‐Derived Fungus Penicillium paneum SD‐44.
Authors: Li Chun‐Shun , Li Xiao‐Ming , An Chun‐Yan , Wang Bin‐Gui 
Published: April 2015

AbstractTwo new β‐carbolines, penipalines A and B (I), and the new indole carbaldehyde derivative, penipaline C (II) are isolated along with two known indole derived analogs from the deep‐sea‐sediment derived fungus Penicillium paneum SD‐44 Compounds (Ib) and (II) exhibit potent cytotoxic activities against A‐549 an HCT‐116 cell lines.
ChemInform Abstract: Neofipiperzine D (I), a New Prenylated Indole Alkaloid Metabolite of the Fungus Neosartorya fischeri
Authors: Chen Bing‐Yu , Wang Zhen , Ying You‐Min , Jiang Lu‐Xi , Zhan Zha‐Jun , Wang Jun‐Lu , Zhang Wei 
Published: April 2015

Abstractisolation, structure determination and cytotoxic activity
ChemInform Abstract: Bifunctional Amine‐Squaramides: Powerful Hydrogen‐Bonding Organocatalysts for Asymmetric Domino/Cascade Reactions
Authors: Chauhan Pankaj , Mahajan Suruchi , Kaya Ugur , Hack Daniel , Enders Dieter 
Published: April 2015

AbstractReview: [93 refs.
EnantioselectivePhotolysis and Quantitative Chiral Analysis of Tryptophan Complexed With Alkali‐Metalized L‐Serine in the Gas Phase
Authors: Fujihara Akimasa , Maeda Naoto , Hayakawa Shigeo 
Published: April 2015

AbstractThe enantioselective photolysis of a cold gas‐phase noncovalent complex of tryptophan with alkali‐metalized L‐serine, M+(L‐Ser)(Trp) (M = Na and Li), was examined using a tandem mass spectrometer containing a variable‐temperature ion trap. CO2 loss from Trp in the clusters was enantiomerically selective in ultraviolet excitation with linearly polarized light. M+(L‐Ser) promoted the enantioselective photolysis of Trp as a chiral auxiliary. The enantioselective photolysis of the D‐enantiomer was applied to a quantitative chiral analysis, in which the optical purity of tryptophan could be determined by measuring the relative abundance ratio R of the enantioselective CO2 loss to the chiral‐independent evaporation of L‐Ser in a single photodissociation mass spectrum of M+(L‐Ser)(Trp). Chirality 27:349–352, 2015. © 2015 Wiley Periodicals, Inc.
Zur Elektrochemie der Zitronenbatterie
Authors: Hagen‐Schittkowski Carina , Vorwerg Ariane , Habekost Achim , Maulbetsch Christoph 
Published: April 2015

AbstractIm vorliegenden Beitrag werden die elektrochemischen Grundlagen der in der Schule beliebten Zitronenbatterie anhand einiger Experimente untersucht. Die Zitronenbatterie unter Last kann als Zink‐Wasserstoff‐Korrosionselement interpretiert werden. Der Spannungsabfall zwischen Zink und Kupfer in Zitronensäure‐Lösung ist dagegen nicht einfach zu erklären. Die Schwierigkeiten rühren hauptsächlich von der komplexen Chemie von Kupfer‐Spezies in wässrigen Lösungen her. Wir empfehlen daher, die Zitronenbatterie nicht als Beispiel im Chemieunterricht zu behandeln.
NIR Fluorogenic Dye as a Modular Platform for Prodrug Assembly: Real‐Time in vivo Monitoring of Drug Release
Authors: Redy‐Keisar Orit , Ferber Shiran , Satchi‐Fainaro Ronit , Shabat Doron 
Published: April 2015

AbstractThe ability to monitor drug release in vivo provides essential pharmacological information. We developed a new modular approach for the preparation of theranostic prodrugs with a turn‐ON near‐infrared (NIR) fluorescence mode of action. The prodrugs release their chemotherapeutic cargo and an active cyanine fluorophore upon reaction with a specific analyte. The prodrug platform is based on the fluorogenic dye QCy7; upon removal of a triggering substrate, the dye fluoresces, and the free drug is released. The evaluated camptothecin prodrug was activated by endogenous hydrogen peroxide produced in tumor cells in vitro and in vivo. Drug release and in vitro cytotoxicity were correlated with the emitted fluorescence. The prodrug activation was effectively imaged in real time in mice bearing tumors. The modular design of the QCy7 fluorogenic platform should allow the preparation of numerous other prodrugs with various triggering substrates and chemotherapeutic agents. We anticipate that the development of real‐time in vivo monitoring tools such as that described herein will pave the way for personalized therapy.
Bis(benzoyloxybenzyl)‐DiPPro Nucleoside Diphosphates of Anti‐HIV Active Nucleoside Analogues
Authors: Weinschenk Lina , Gollnest Tristan , Schols Dominique , Balzarini Jan , Meier Chris 
Published: April 2015

AbstractNucleoside analogues are extensively used as antiviral and anticancer agents. Their efficiency is dependent on their metabolism into the ultimately active nucleoside triphosphates. Often one step or even more in the metabolism of the nucleoside to the triphosphate is inefficient. To overcome this hurdle, prodrugs of the nucleotides are needed. Bis(acyloxybenzyl)nucleoside diphosphates have been reported by us as a first example of an efficient nucleoside diphosphate prodrug (DiPPro nucleotides). Here, the synthesis and the properties of bis(benzoyloxybenzyl)nucleoside diphosphates of the nucleoside analogues d4T and AZT are disclosed. The synthesis was achieved by using a phosphoramidite/oxidation route. In chemical hydrolysis studies, most of the compounds formed a nucleoside diphosphate. This was confirmed in CEM cell extracts, although the prodrug stability in extracts was lower than in phosphate buffer. Furthermore, the stability and the amount of nucleoside diphosphate formed were dependent on the substituent in the benzoyl moiety. Some of the compounds were more active against HIV in thymidine kinase‐deficient CEM/TK− cells than were d4T or AZT.
Renal function in survivors of nonsyndromic Wilms tumor treated with unilateral radical nephrectomy
Authors: Interiano Rodrigo B. , Delos Santos Noel , Huang Sujuan , Srivastava Deo Kumar , Robison Leslie L. , Hudson Melissa M. , Green Daniel M. , Davidoff Andrew M. 
Published: April 2015

BACKGROUNDPartial nephrectomy is considered by some for children with unilateral Wilms tumor (UWT) to avoid the theoretical complication of renal insufficiency. In the current study, the authors evaluated the prevalence of hypertension and impaired renal function in long‐term survivors of nonsyndromic UWT who were treated without nephrotoxic chemotherapy or ionizing radiation.METHODSEligibility included age ≤15 years at the time of diagnosis of nonsyndromic UWT, treatment receipt before 2002, and maintenance of disease remission after unilateral nephrectomy without receipt of abdominal irradiation or nephrotoxic chemotherapy. Renal function was assessed by urinalysis and estimated glomerular filtration rate (eGFR). Patients receiving antihypertensive medication or those with blood pressure readings of >140/90 mm Hg were considered to be hypertensive.RESULTSA total of 75 patients with a median age at diagnosis of 3.2 years (range, 0.2‐12.1 years) met eligibility criteria. The median length of follow‐up was 19.6 years (range, 10.0‐32.8 years). All but 1 patient had stage I/II disease. Sixty‐eight patients (90.7%) patients had WT with favorable histology and 7 patients had anaplastic histology. Sixteen patients (21.3%) had an eGFR <90 mL/minute/1.73m2, 2 of whom also had proteinuria (12.5%). No patient had an eGFR <60 mL/minute/1.73m2. Five patients (6.7%) had hypertension, 3 of whom were receiving antihypertensive medications. At the time of last follow‐up, no patient had developed end‐stage renal disease.CONCLUSIONSPatients with UWT who were treated with unilateral radical nephrectomy without nephrotoxic chemotherapy or ionizing radiation appear to be at low risk of developing significant long‐term renal dysfunction. For this patient population, the routine use of partial nephrectomy does not appear justified. However, monitoring and counseling are important for identifying the rare patient who develops subtle renal insufficiency and therefore might be at an increased risk of adverse cardiovascular sequelae. Cancer 2015;121:2449–2456. © 2015 American Cancer Society.
SDIVIP2: shared data integrity verification with identity privacy preserving in mobile clouds
Authors: Yu Yong , Ni Jianbing , Xia Qi , Wang Xiaofen , Yang Haomiao , Zhang Xiaosong 
Published: April 2015

SummaryMobile networks integrate cloud computing to impair the weaknesses of the mobile terminals. With mobile cloud storage, mobile users can fully enjoy the advantages from both mobile networks and cloud storage. However, a major concern of mobile users is how to guarantee the integrity of their outsourced data. Taking into account the mobility of mobile devices, in this paper, we propose a shared data integrity verification protocol with identity privacy preserving, named SDIVIP2, for mobile cloud storage. In the construction of SDIVIP2, the dynamic group key agreement technique is employed for key sharing among a group of mobile users and the proxy re‐signature mechanism is utilized to update tags efficiently when users in the group change. In this new protocol, a third party auditor is able to verify the correctness of cloud data without the knowledge of mobile users' identities during the data integrity checking process. Performance analysis demonstrates that SDIVIP2 outperforms the existing schemes in the sense that it can significantly enhance the efficiency of mobile users' joining and leaving a group. Copyright © 2015 John Wiley & Sons, Ltd.
Modulation of Electron Injection Dynamics of Ru‐Based Dye/TiO2 System in the Presence of Three Different Organic Solvents: Role of Solvent Dipole Moment and Donor Number
Authors: Mahanta Subrata , Matsuzaki Hiroyuki , Murakami Takurou N. , Katoh Ryuzi , Matsumoto Hajime , Furube Akihiro 
Published: April 2015

AbstractIn the present work, femtosecond transient absorption spectroscopy (fs‐TAS) has been employed to investigate the electron injection efficiency (EIE) both from the singlet and triplet excited states of a well‐known ruthenium dye (N719) to the conduction band (CB) of nanostructured TiO2 in presence of three different organic solvents [γ‐butylactone (GBL), 3‐methoxypropionitrile (MPN), and dimethylformamide (DMF)] with different donor numbers (DNs) and dipole moments (DMs). The DM and DN of a solvent modulates the CB edge energy of TiO2, and this effect reflects well in the fs‐TAS results, which shows an EIE trend following the order GBL≥MPN≫DMF, that is, highest in GBL and lowest in DMF solvent environments. Fs‐TAS results indicate a lower contribution of electron injection from both the singlet and triplet states in DMF, for which the dominant adsorption of DMF molecules on the TiO2 surface seems to play an important role in the mechanism.
Investigation of Thermodynamic, Dynamic, and Structural Properties of H2 Adsorption on a Ag–Au Nanoalloy with a Carbon Nanotube Support
Authors: Akbarzadeh Hamed , Abbaspour Mohsen , Salemi Sirous , Dastoorani Mahmood 
Published: April 2015

AbstractWe have performed MD simulations to investigate H2 adsorption on Ag–Au nanoclusters with the different Au mole fractions supported on the carbon nanotubes with the different diameters. Our thermodynamic results shown that the saturation value of coverage and the enthalpy of adsorption increases as the mole fraction of Au is increased. Our structural results showed that the presence of the H2 gas exerts a significant effect on the nanocluster surface atoms and tends to stabilize the surface atoms on the nanocluster. Also, the structural changes are irreversible in such a way that by gradually decreasing the pressure to zero, the nanocluster geometry is not reversed to its initial structure in vacuum conditions. We have also shown that the nanoclusters have smaller values of the self‐diffusion coefficients in presence of H2 molecules than those values in the initial state (vacuum), which is due to the increasing of the interface structure between the nanocluster and the nanotube.
Thermal Stability and Molecular Ordering of Organic Semiconductor Monolayers: Effect of an Anchor Group
Authors: Jones Andrew O. F. , Knauer Philipp , Resel Roland , Ringk Andreas , Strohriegl Peter , Werzer Oliver , Sferrazza Michele 
Published: April 2015

AbstractThe thermal stability and molecular order in monolayers of two organic semiconductors, PBI‐PA and PBI‐alkyl, based on perylene derivatives with an identical molecular structure except for an anchor group for attachment to the substrate in PBI‐PA, are reported. In situ X‐ray reflectivity measurements are used to follow the stability of these monolayers in terms of order and thickness as temperature is increased. Films have thicknesses corresponding approximately to the length of one molecule; molecules stand upright on the substrate with a defined structure. PBI‐PA monolayers have a high degree of order at room temperature and a stable film exists up to 250 °C, but decomposes rapidly above 300 °C. In contrast, stable physisorbed PBI‐alkyl monolayers only exist up to 100 °C. Above the bulk melting point at 200 °C no more order exists. The results encourage using anchor groups in monolayers for various applications as it allows enhanced stability at the interface with the substrate.