bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Radical‐Radical and Metal–Metal Coupling Tetrathiafulvalene Derivative in which Organic Radicals Directly Coordinate to CuII Ions
Authors: Lu Wen , Zhang Yong , Dai Jie , Zhu Qin‐Yu , Bian Guo‐Qing , Zhang De‐Qing 
Published: February 2006

AbstractA new dinuclear metal complex including tetrathiafulvalene (TTF) radicals as ligands has been prepared and characterized, [{DMT‐TTF(CONH2)2}2Cu2Cl6] (1), DMT‐TTF(CONH2)2 = o‐bis(amido)‐appended dimethylthio‐tetrathiafulvalene. The compound is an uncommon example in which TTF radicals directly coordinate to the copper(II) halide by the amido group. Crystal structure analysis shows that it is a unique coordination bond/H‐bond/S···S stacking cooperative system with two radicals and two paramagnetic transition metal ions, TTF+·–CuII–CuII–TTF+·. In the structure of 1, the DMT‐TTF units form dimers with very strong S···S interactions. The CuII–O(amide) distance of the coordination bond is 2.271(2) Å and the S···S stacking distances between the radicals are in the range 3.345–3.489 Å. The metal–metal ions are mildly antiferromagnetically coupled (2J1 =–58.4 cm–1), while the radical pairs are strongly antiferromagnetically coupled (2J2 > –1000 cm–1).(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Zinc Thiolate Complexes [ZnLn(SR)]+ with Azamacrocyclic Ligands: Synthesis and Structural Properties
Authors: Notni Johannes , Görls Helmar , Anders Ernst 
Published: February 2006

AbstractA series of 24 novel zinc thiolate complexes containing saturated macrocyclic polyamine ligands with the general formula [Zn(Ln)(SR)]ClO4 (Ln: n‐dentate azamacrocyclic ligand) has been synthesized. Two different thiolate ligands (R = phenyl, benzyl) and 12 macrocyclic ligands with ring sizes varying from 11 to 16 atoms and containing three, four, and five nitrogen donors (including a new macrocyclic triamine ligand, 8‐methyl‐[11]aneN3) have been used. The solid‐state structures of 20 of the 24 complexes have been characterized by X‐ray diffraction. The crystal lattice of all compounds is comprised exclusively of monomers. The tetracoordinate N3S compounds exhibit Zn–S bond lengths ranging from 2.2259(5) to 2.2492(9) Å and the pentacoordinate N4S systems from 2.266(2) to 2.3200(7) Å. In addition, two complexes with the very rare N5S coordination environment for zinc have been found. They exhibit Zn–S bond lengths of 2.3782(7) and 2.42 Å (mean value of two independent molecules). The thiolate complexes are suitable model systems for the precursor proteins of matrix metalloproteases (pro‐MMPs) as well as for thiolate alkylating enzymes such as cobalamine‐dependent/independent methionine synthases, farnesyl transferase, and the Ada repair protein. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Dipolar Organoiron Pyranylideneacetaldehyde Hydrazone Complexes: Synthesis, Characterization, Crystal Structure, Linear and Nonlinear Optical Properties
Authors: Millán Lorena , Fuentealba Mauricio , Manzur Carolina , Carrillo David , Faux Nadège , Caro Bertrand , Robin‐Le Guen Françoise , Sinbandhit Sourisak , Ledoux‐Rak Isabelle , Hamon Jean‐René 
Published: February 2006

AbstractNew cationic organoiron(II) pyranylideneacetaldehyde hydrazone complexes were prepared in high yields through condensation reactions of the organometallic hydrazine precursor [CpFe(η6‐p‐MeC6H4NHNH2)]+PF6– with differently substituted α‐ and γ‐pyranylideneacetaldehydes. The mononuclear hydrazones were stereoselectively obtained as their (E) isomers about the N=C double bond. All the new compounds were thoroughly characterized by a combination of elemental analysis and spectroscopic techniques (1H and 13C NMR, IR, and UV/Vis), and by a single‐crystal X‐ray diffraction analysis of the 2‐tBu‐chromene derivative 5. The spectroscopic data suggest that these complexes have a partial pyrylium character due to the electron‐accepting ability of the cationic organometallic fragment and to the electron‐releasing properties of the methylenepyran‐based donor. The crystal structure of 5 shows that the η6‐coordinated tolyl ring and the pyran ring are coplanar (dihedral angle 3.2°), a favorable situation that allows conjugation between the intracyclic oxygen atom and the cationic iron center through the entire hydrazone backbone. Compounds 4–6 are strongly polarized D–π–A systems that exhibit solvatochromic properties, low‐lying intramolecular charge‐transfer bands in their electronic absorption spectra, and enhanced second‐order NLO properties (μβ), as measured by the EFISH technique at 1.907 μm. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Synthesis of η2‐Allene Complexes by the Reaction of a η1‐Vinylidene Tungsten Complex with Diazoalkanes
Authors: Ipaktschi Junes , Rooshenas Parham , Dülmer Ansgar 
Published: February 2006

AbstractThe reaction of the η1‐vinylidene complex Cp(CO)(NO)W=C=CH2 (5) with diazomethane, to give complex 8, as well as with ethyl diazoacetate, to give complexes 10 and 11, is described. The crystal structures of these complexes are reported. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Facile Synthesis of SnO2 Hollow Nanospheres and Applications in Gas Sensors and Electrocatalysts
Authors: Zhao Qingrui , Gao Yang , Bai Xue , Wu Changzheng , Xie Yi 
Published: February 2006

AbstractTin oxide (SnO2) hollow nanospheres have been successfully synthesized from mixed ethanol and water systems containing the surfactants sodium dodecyl benzenesulfonate (SDBS) and terephthalic acid. Systematic studies reveal that terephthalic acid plays pivotal roles in the formation of hollow nanospheres. In the present work, the as‐synthesized SnO2 hollow nanospheres exhibit excellent room‐temperature ethanol sensitivity and potential catalytic ability towards the electrooxidation of ethanol, and thus are expected to be economical alternative catalysts and useful in industrial applications such as room‐temperature gas sensors. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Synthesis and Reactivity of [Ru(Cp*)(L)(MeCN)2][PF6] (L = Ph2POMe or Ph2P‐o‐tolyl) and {Ru(Cp*)[Ph2PCH2C(tBu)=O](MeCN)}[PF6] Complexes, Their Involvement as Catalyst Precursors for Regioselective Allylic Substitution Reactions and Related [Ru(Cp*)Cl(Ph2POMe)(RCHCHCH2)][PF6] η3‐Allyl Ruthenium(IV) Intermediates
Authors: Demerseman Bernard , Renaud Jean‐Luc , Toupet Loïc , Hubert Claudie , Bruneau Christian 
Published: February 2006

AbstractThe synthesis of the new complexes [Ru(Cp*)(L)(MeCN)2][PF6] (L = Ph2POMe or Ph2P‐o‐tolyl) and {Ru(Cp*)[Ph2PCH2C(tBu)=O](MeCN)}[PF6] (2a–c) is achieved starting from [Ru(Cp*)(MeCN)3][PF6]. The acetonitrile ligands in complexes 2a–c are labile, as emphasised by the easy formation of {Ru(Cp*)(CO)2[Ph2PCH2C(=O)tBu]}[PF6] (3). The keto‐phosphane is used as a tool to convert 3 into {Ru(Cp*)(CO)[Ph2PCH2C(tBu)=O]}[PF6] (5). Complex 5 reacts with 1,1‐diphenyl‐2‐propyn‐1‐ol in methanol as solvent toafford the vinyl‐carbene complex {Ru(Cp*)(CO)[=C(OMe)CH=CPh2][Ph2PCH2C(=O)tBu]}[PF6]. The new η3‐allyl ruthenium(IV) derivatives [Ru(Cp*)Cl(Ph2POMe)(CH2CMeCH2)][PF6] and [Ru(Cp*)Cl(Ph2POMe)(RCHCHCH2)][PF6] (R = Me; nPr, 8d; or Ph, 8e) are obtained by reacting 2a with the appropriate allylic halide. The X‐ray crystal structure determination of the compounds 8d and 8e disclosed an endo‐trans‐RCHCHCH2 η3‐allyl ligand. The formation of branched allyl aryl ethers is regioselectively favoured when complexes 2a–c are involved as catalyst precursors for the etherification of cinnamyl chloride, chlorohexene and 3‐chloro‐4‐phenylbut‐1‐ene with phenol, p‐methoxyphenol, cresols and (o or p)‐chlorophenols, in the presence of K2CO3. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Decameric Water Clusters Shaped as Two Parallel Cyclic Pentamers with Staggered Conformation Stabilize Supramolecularly Bonded Infinite Chains of H2PO4– Ions
Authors: Ghosh Sujit K. , Bharadwaj Parimal K. 
Published: February 2006

AbstractA laterally nonsymmetric aza‐cryptand on acidification with H3PO4 affords an H‐bonded infinite chain of H2PO4– ions. These chains are aligned parallel through H‐bonding interactions with discreet decameric water clusters leaving large void spaces. Diprotonated cryptand molecules occupy these voids through supramolecular interactions. The crystal data for the compound are: triclinic space group P$\bar {1}$, a = 12.765(5), b = 13.254(2), c = 13.817(4) Å, V = 2137.3(14) Å3, Z = 2, R1 = 0.0582, wR2 = 0.1339, S = 1.092.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Photoinduced Phase Transition of the Coordinationally Unsaturated d9 Metal Centers of Bis(N,N‐diethylethylenediamine)copper(II) Perchlorate within the Thermal Hysteresis of the Spin‐Exchange Interaction
Authors: Naumov Panče , Sakurai Kenji , Asaka Toru , Belik Alexei A. , Adachi Shin‐ichi , Takahashi Junichi , Koshihara Shin‐ya 
Published: February 2006

AbstractDiffraction evidence is presented that the structure of one‐dimensional arrays of strained, coordinationally unsaturated d9 pseudo‐Jahn–Teller centers of bis(N,N‐diethylethylenediamine)copper(II) perchlorate is affected by excitation of the LMCT bands within the hysteresis region of a low‐temperature ferromagnetic‐to‐antiferromagnetic phase transition. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Enolate‐Phosphane Ligands Providing a Tool for the Selective Substitution of Triphenylphosphane by Carbon Monoxide or Trimethylphosphane in Complex {Ru(Cp)[η2‐P,O‐Ph2PCH2C(tBu)=O](PPh3)}[PF6], and Subsequent Reactivity Towards Terminal Alkynes
Authors: Demerseman Bernard , Toupet Loïc 
Published: February 2006

AbstractThe deprotonation under basic conditions of the keto‐phosphane ligand in complexes {Ru(Cp)[η1‐P‐Ph2PCH2C(=O)tBu](PPh3)(L)}[PF6] (L = CO or PMe3) that arise from the addition of L to {Ru(Cp)[η2‐P,O‐Ph2PCH2C(tBu)=O](PPh3)}[PF6] generates {Ru+(Cp)[η1‐P‐Ph2PCH=C(tBu)O–](PPh3)(L)} zwitterionic species, as shown by an X‐ray crystal structure determination (L = CO). The removal of the triphenylphosphane ligand is subsequently achieved under thermal activation to afford the neutral derivatives Ru(Cp)[η2‐P,O‐Ph2PCH=C(tBu)O](L). A further protonation step is sufficient to complete the formation of the new complex {Ru(Cp)[η2‐P,O‐Ph2PCH2C(tBu)=O](PMe3)}[PF6], which reacts in methanolat reflux with 1,1‐diphenyl‐2‐propyn‐1‐ol to afford thesix‐membered metallacyclic derivative {Ru(Cp)[η2‐C,P:C(CH=CPh2)OC(tBu)=CH–PPh2](PMe3)}[PF6], as shown by an X‐ray single crystal analysis. The synthesis of related η5‐indenyl ruthenium complexes and of {Ru(Cp)(=C=CH2)[Ph2PCH2C(=O)tBu](PR3)}[PF6] (PR3 = PPh3 or PMe3) vinylidene complexes is also reported. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Surface bloom on improperly tempered chocolate
Authors: Lonchampt Pierre , Hartel Richard W. 
Published: February 2006

AbstractThe surface composition, in terms of sugar and fat content, on untempered and over‐tempered chocolates was estimated by carefully scraping the surface layer and analyzing fat and sugar melting enthalpies by differential scanning calorimetry. The dull surface of over‐tempered chocolate had a fat and sugar composition similar to the initial chocolate mass, whereas the surface bloom formed on untempered chocolate was nearly depleted of fat, containing primarily sugar and cocoa solids. This was confirmed qualitatively by using polarized light microscopy, where no fat crystals could be observed in the bloom spots. Bloom on untempered chocolate corresponded to a phase separation between fat, sugar and cocoa solids. In contrast, the grey, dull aspect of the surface of over‐tempered chocolate had essentially the same sugar‐to‐fat ratio as the intact chocolate and was due to a diffuse reflection of light on a rough surface, most likely induced by large cocoa butter crystals. Bloom on untempered chocolate developed regardless of the relative humidity of storage (between 0 and 75%). However, bloom developed more quickly and to a greater extent at lower relative humidity. Whiteness was directly related to the number, diameter and growth speed of the white bloom spots.
Diversity Linker Units for Solid‐Phase Organic Synthesis
Authors: Scott Peter J. H. , Steel Patrick G. 
Published: February 2006

AbstractIn recent years an ever‐increasing number of traditional solution‐phase reactions have been adapted for solid‐phase organic synthesis (SPOS) because of the ease of application of solid‐phase techniques to combinatorial chemistry and high‐throughput screening. To accommodate the growing number of reactions being attempted on solid supports, new linker units continue to be reported in the literature. Linker units are typically grouped according to the functionality left at the “cleavage site” in the target molecule, and are normally classified as traditional (polar functionality remains following cleavage) or traceless (hydrogen residue left after cleavage) linkers. As the field continues to expand, however, more advanced linker units have been reported, which utilise the cleavage step in SPOS to incorporate additional diversity into target libraries. These linker units have been termed “diversity” or “multifunctional” linker units, and in this microreview we introduce this aspect of the field, giving representative examples indicating key stages of development including the linker units recently designed in our laboratory. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Enantiospecific Synthesis of (+)‐Hyacinthacine A2
Authors: Dewi‐Wülfing Purnama , Blechert Siegfried 
Published: February 2006

AbstractWe report an efficient synthesis of (+)‐hyacinthacine A2 in six steps from (S)‐N‐Cbz‐vinylgylcine. The key strategies were the olefin cross metathesis (CM), Sharpless asymmetric dihydroxylation, and a sequential double reductive cyclization. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
Testing excision models for responses of mismatch‐repair systems to UV photoproducts in DNA
Authors: Wang Huxian , Hoffman Peter D. , Lawrence Christopher , Hays John B. 
Published: February 2006

AbstractMismatch‐repair (MMR) systems correct DNA replication errors and respond to a variety of DNA lesions. Previous observations that MMR antagonizes UV mutagenesis, and that the mismatch‐recognition protein heterodimer MSH2•MSH6 (MutSα) selectively binds DNA containing “mismatched” photoproducts (T[CPD]T/AG, T[6‐4]T/AG) but not “matched” photoproducts (T[CPD]T/AA, T[6‐4]T/AA), suggested that mismatched photoproducts would provoke MMR excision similar to mismatched bases. Excision of incorrect nucleotides inserted opposite template photoproducts might then prevent UV‐induced mutation. We tested T[CPD]T/AG DNA, in a sequence context in which it is bound substantially by hMutSα and in three other contexts, for stimulation of 3′ MMR excision in mammalian nuclear extracts. T[CPD]T/AG was inactive in HeLa extracts, or in extracts deficient in the photoproduct‐binding proteins DDB or XPC• hHR23B, arguing against interference from the nucleotide excision repair pathway. Prior incubation with hMutSα and MLH2·PMS2 (hMutLα) did not increase excision relative to homoduplex controls. T[6‐4]T/AG also failed to provoke excision. T/G, C/A, and T/T substrates, even though bound by hMutSα no better than T[CPD]T/AG substrates, efficiently provoked excision. Even a substrate containing three T[CPD]T/AG photoproducts (in different contexts) did not significantly provoke excision. Thus, MMR may suppress UV mutagenesis by non‐excisive mechanisms. Environ. Mol. Mutagen., 2006. © 2006 Wiley‐Liss, Inc.
Identification of candidates for tumor‐specific alternative splicing in the thyroid
Authors: Guimarães Gustavo S. , Latini Flávia R. M. , Camacho Cléber P. , Maciel Rui M. B. , Dias‐Neto Emmanuel , Cerutti Janete M. 
Published: February 2006

AbstractAlternative splicing is the differential processing of exon junctions to produce a new transcript variant from one gene. Some aberrant splicing, however, has been shown to be cancer specific. Identification of these specific splice variations will provide important insight into the molecular mechanism of normal cellular physiology as well as the disease processes. To gain knowledge about whether alternative splicing is linked to thyroid tumorigenesis, we used our prediction database to select targets for analysis. Fifteen putatively new alternative splicing isoforms were selected on the basis of their expression in thyroid libraries and/or their origin in genes previously associated with carcinogenesis. Using a set of 66 normal, benign, and malignant thyroid tissue samples, new splicing events were confirmed by RT‐PCR for 13 of 15 genes (a validation rate of 87%). In addition, new alternative splicing isoforms not predicted by the system and not previously described in public databases were identified. Five genes (PTPN18, ABI3BP, PFDN5, SULF2, and ST5) presented new and/or additional unpredicted isoforms differentially expressed between malignant and benign or normal thyroid tissues, confirmed by sequencing. PTPN18, ABI3BP, and PFDN5 revealed a statistically significant differential splicing profile. In addition, real‐time PCR analysis revealed that expression of an alternative PFDN5 variant was higher in malignant lesions than in benign lesions or normal tissues. © 2006 Wiley‐Liss, Inc.
Enzymatic Approach to and Odor Description of the Twelve Enantiomerically Pure Isomers of Pelargene®
Authors: Abate Agnese , Allievi Maurizio , Brenna Elisabetta , Fuganti Claudio , Gatti Francesco G. , Serra Stefano 
Published: February 2006

AbstractPelargene® is a commercial fragrance sold as a mixture of three regioisomeric pyran derivatives (1–3). The enantiomers of each of the two possible diastereoisomers of 1–3 were prepared by means of a biocatalyzed approach, and the odor properties of the twelve isolated stereoisomers were evaluated.
Structure Investigation of Bridgehead Aziridine: Synthesis, Theoretical, and Crystallographic Study of 2,4,6‐Triphenyl‐1,3‐diazabicyclo[3.1.0]hex‐3‐ene
Authors: Bruno Giuseppe , Nicolò Francesco , Rotondo Archimede , Risitano Francesco , Grassi Giovanni , Foti Francesco 
Published: February 2006

AbstractA one‐pot three‐component procedure to efficiently create the 1,3‐diazabicyclo[3.1.0]hex‐3‐ene system is reported. The molecular structure of 2,4,6‐triphenyl‐1,3‐diazabicyclo[3.1.0]hex‐3‐ene (3) was studied by X‐ray diffraction and compared to ab initio and density‐functional‐theory (DFT) calculations restricted to the core moiety. Geometry optimizations for structural isomers and tautomeric forms of this aziridine fragment, taken as simplified models, were carried out at high calculation levels. Moreover, the same methods were utilized to evaluate the proton affinity of two crucial aziridine tautomers.
Novel Steroidal Glycosides from two Indian Caralluma species, C. stalagmifera and C. indica
Authors: Kunert Olaf , Rao Belvotagi Venkatrao Adavi , Babu Gummadi Sridhar , Padmavathi Medaboyina , Kumar Bobbala Ravi , Alex Robert Michael , Schühly Wolfgang , Simic Nebojsa , Kühnelt Doris , Rao Achanta Venkata Narasimha Appa 
Published: February 2006

AbstractNew steroidal glycosides, stalagmosides I–V (1–5) and indicosides I and II (7 and 8), together with the known compounds carumbelloside III, lasianthoside A, and lasianthoside B, were isolated from whole plants of Caralluma stalagmifera and Caralluma indica, respectively. Their structures were elucidated by extensive NMR spectroscopic studies.
Norditerpenoid Alkaloids from the Aerial Parts of Aconitum cochleareWoroschin
Authors: Meriçli Ali H. , Pırıldar Sevda , Süzgeç Sevda , Bitiş Leyla , Meriçli Filiz , Özçelik Hasan , Zapp Josef , Becker Hans 
Published: February 2006

AbstractFrom the aerial parts of Aconitum cochleare Woroschin, two new norditerpenoid alkaloids named aconitilearine (1) and N‐deethylmethyllycaconitine (2) were isolated along with the eight known norditerpenoid alkaloids 3–10. The structures for the new compounds were established on the basis of 1H, 13C, DEPT, homonuclear 1H,1H‐COSY, NOESY, HSQC, and HMBC NMR studies.
Total Synthesis of (+)‐β‐Himachalene
Authors: Ho Tse‐Lok , Chein Rong‐Jie 
Published: February 2006

AbstractAn enantioselective synthesis of (+)‐β‐himachalene (2) was accomplished starting from (1S,2R)‐1,2‐epoxy‐p‐menth‐8‐ene (3) in 15 or 16 steps with an overall yield of ca. 6% (Schemes 3, 5, and 6). Key transformations include an Ireland–Claisen rearrangement, a Corey oxidative cyclization, and a ring expansion.
Formation of Dimers of Some 2‐Substituted Indan‐1‐one Derivatives during Base‐Mediated Cross‐Aldol Condensation
Authors: Narang Gaurav , Jindal Dharam Paul , Jit Birinder , Bansal Ranju , Potter Brian S. , Palmer Rex A. 
Published: February 2006

AbstractUnexpected dimers of some 2‐substituted indan‐1‐one derivatives were isolated during aldol condensation of indan‐1‐one with various aldehydes in the presence of KOH (see Scheme). Monomeric products, usually expected from aldol condensation, further underwent a base‐catalyzed nucleophilic addition reaction to their dimeric form in some cases. The structures of these dimers were characterized by using various spectral techniques and in one case, structural details were determined from a high‐resolution crystallographic analysis.
A One‐Dimensional Thallium(I) Coordination Polymer Involving Polyhapto‐Aromatic Interactions
Authors: Askarinejad Azadeh , Morsali Ali 
Published: February 2006

AbstractA one‐dimensional coordination polymer involving Tl ⋅⋅⋅ C interactions, [Tl(μ4‐dpa)]n(Hdpa = diphenylacetic acid), was synthesized and characterized. The single‐crystal X‐ray data of the compound show that the coordination number of the TlI ions is five and that Tl centers have an irregular coordination sphere containing a ‘configurationally active’ lone pair/hexahapto (η6) interaction, thus resulting in a total hapticity of eleven for a TlC6O5 environment.
An Alternative Synthesis of the Dopaminergic Drug 2‐Amino‐1,2,3,4‐tetrahydronaphthalene‐5,6‐diol (5,6‐ADTN)
Authors: Göksu Süleyman , Seçen Hasan , Sütbeyaz Yaşar 
Published: February 2006

AbstractRacemic 2‐amino‐1,2,3,4‐tetrahydronaphthalene‐5,6‐diol (5,6‐ADTN; 4) was synthesized from 5,6‐dimethoxynaphthalene‐2‐carboxylic acid (14) in four steps (60% overall yield; Scheme). The crucial steps of the synthesis are Birch reduction of 14 to the valuable synthon 15, Curtius reaction and carbamate formation (16), hydrogenolysis (17), and demethylation to the biologically active hydrobromide salt 18 of 4.
Synthesis, Characterization, and X‐Ray Crystal Structures of Bis[N‐(3,3‐diphenylallylidene)quinolin‐8‐amine‐κN,κN8]copper(1+) Tetraphenylborate(1−) ([Cu(dpa‐qa)2]BPh4) and Bis[N,N′‐bis(3,3‐diphenylallylidene)‐[1,1′‐biphenyl]‐2,2′‐diamine‐κN,κN′]copper(1+) Perchlorate ([Cu(bdpa‐bda)2]ClO4 ⋅ 3 H2O)
Authors: Amirnasr Mehdi , Kickelbick Guido , Dehghanpour Saeed 
Published: February 2006

AbstractTwo new ligands, N‐(3,3‐diphenylallylidene)quinolin‐8‐amine (dpa‐qa; L1) and N,N′‐bis‐(3,3‐diphenylallylidene)[1,1′‐biphenyl]‐2,2′‐diamine (bdpa‐bda; L2), and their corresponding copper(I) complexes, [Cu(dpa‐qa)2]BPh4 (1) and [Cu(bdpa‐bda)2]ClO4 ⋅ 3 H2O (2), were synthesized and characterized by C,H,N analyses, 1H‐ and 13C‐NMR, IR, and UV/VIS spectroscopy. The crystal and molecular structures of 1 and 2 were determined by X‐ray crystallography from single‐crystal data. Complex 1 crystallizes in the orthorhombic space group Pbca, with a = 14.391(3) Å, b = 21.967(5) Å, c = 35.463(8) Å, V = 11211(4) Å3, and Z = 8. Complex 2 crystallizes in the monoclinic space group C2/c, with a = 30.746(10) Å, b = 18.244(6) Å, c = 27.835(9) Å, β = 109.794(7)°, V = 14691(8), and Z = 8. The coordination polyhedron about the CuI center in the two complexes is best described as a distorted tetrahedron. A quasireversible redox behavior is observed for complex 1 and 2 (E1/2 = 0.58 and 1.04 V).