ISSN:0021-2148    

DOI:10.1002/ijch.198600043

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractThe synthesis and some properties of polymeric heterocycles as well as the latest results in the area of soluble conducting polymers are reviewed. Polyheterocycles with long chain substituents exhibit unusual properties in solution while retaining a relatively high conductivity in the solid state. All known methods for the preparation of conducting polymers are presented and their merits discussed. Among the insoluble polymers, the electrochemical methods are still the best because they afford films on a large variety of substrates.

ISSN:0021-2148    

DOI:10.1002/ijch.198600044

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractPhysicochemical issues are discussed which are relevant to chemists interested in the synthesis of unknown compounds to serve as precursors to organic metals. Molecular topics are emphasized, physical and structural concepts which motivate synthetic activity in chalogen chemistry are presented, and new results in selenium and tellurium systems are summarized. Two model representations for donor molecular structures based on polyenes and polyacenes are presented and known examples are discussed. Quantitative correlations between gas phase vertical ionization potential and solution electrochemical redox potential are examined using donors of interest for organic metals as data. Limitations of such correlations and consequences of these shortcomings are given. Finally, possible future directions for several of these topics are posed.

ISSN:0021-2148    

DOI:10.1002/ijch.198600045

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

ISSN:0021-2148    

DOI:10.1002/ijch.198600046

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractThe new aspects of molecular conductors are reviewed. The origin of the two‐dimensionality of the system is interpreted on the basis of the simple tight‐binding band examinations. The charge distribution rule which emerges in these systems is described in relation to the multi‐dimensionality of these comp

ISSN:0021-2148    

DOI:10.1002/ijch.198600047

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractThe synthesis, crystal structures and band electronic structures of BEDT‐TTF based synmetals are discussed, where BEDT‐TTF is bis(ethylenedithio)‐tetrathiofulvalene here abbreviated to “ET”. The electrical properties of ET:X salts above their phase transitions are either 1D [for (ET)2X, where X−= ICl2−, AuBr2−, Au(CN)2−and Ag(CN)2−], 2D metallic [for (ET)2X, where X−= I3−, AuI2−, IBr2−and I2Br−] or 3D metallic [for (ET)Ag4(CN)5]. The β‐(ET)2X (X−= I3−, AuI2−and IBr2−) salts become ambient pressure organic superconductors at 1,4 K (or ∼ 8 K under pressure), 5.0 K, and 2.8 K, respectively. The variation of critical temperatures of this series of β‐(ET)2X salts are correlated to the respective changes in unit cell volume or in the de

ISSN:0021-2148    

DOI:10.1002/ijch.198600048

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractA series of tetrakis(n‐alkylthio)tetrathiafulvalene (alkyl‐methyl to octadecyl; TTCn‐TTF (n= 1‐18) has been synthesized. Synthesis, structure, and some physical properties of these uncapped analogues of bis(ethylenedithiolo)tetrathiafulvalene (BEDT‐TTF) are described and compared with those of BEDT‐TTF. Several charge transfer complexes of TTC1‐TTF are presented in terms of their electrical conductivities, ionicity, structures, and intermolecular interactions and compared with those of BEDT‐TTF compounds. Molecular conformation, mode of the sulfur‐to‐sulfur atomic contacts, and requirements for an organic metal are discussed from the viewpoint of t

ISSN:0021-2148    

DOI:10.1002/ijch.198600049

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractThe structural and electrical properties of a series of (BEDT‐TTF)2X salts are systematized in terms of a substructure‐superstructure relationship which is induced by variation in anion symmetry and pictorially represented as a crystallographic family tree. Importantly, it is recognized that the ambient‐pressure superconductors α‐(BEDT‐TTF)2I3, α‐(BEDT‐TTF)2IBr2, and α‐(BEDT‐TTF)2AuI2have crystal structures coincident with the parent subcell of this crystallographic family tree. Moreover, all first‐generation supercells (doubling of any one subcell vector) are exclusively populated by salts with non‐centrosymmetric anions of tetrahedral symmetry, and, apparently, second‐generation supercells (doubling of any two subcell vectors) are populated by salts with centrosymmetric anions of octahedral symmetry. Finally, trends in structural properties with anion s

ISSN:0021-2148    

DOI:10.1002/ijch.198600050

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractSeveral tetrathiafulvalene (TTF) and tetraselenafulvalene (TSF) salts of tetrahalogenozinc(II) and ‐cadmium(II) anions Dx[MX4] (D = TTF or TSF; M = Zn and Cd; X = Cl, Br, and I;x= 2.0‐6.6) have been prepared by the reaction of [TTF]3[BF4]2or [TSF]3[BF4]2with [NEt4]2[MX4] in acetonitrile and by the electrolysis of TTF or TSF in acetonitrile containing [NEt4]2[MBr4]. Electrical resistivities of these salts measured for compressed pellets fall in the range 1 × (101–107) Ω cm at 25 °C; the value decreases with increasing bulkiness of the anions: [MCl4]2–>[MBr4]2−>[MI4]2−. Stackings and electronic states of TTF and TSF molecules are discussed on the basis of electronic reflectance, ESR, IR, and

ISSN:0021-2148    

DOI:10.1002/ijch.198600051

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY

摘要:

AbstractSmall molecule spectroscopy on M(Pc)(OR)2and ROM(Pc)OM(Pc)OR molecular fragments (M = Si, Ge; Pc = phthalocyaninato) of the conductive polymer [M(Pcp+)O]nprovides a unique probe of the band structure‐forming π‐π interactions. We describe here the synthesis and characterization of the M = Ge monomer and dimer where R = (t‐Bu)Me2Si‐. The lowest energy He I photoelectron spectroscopic feature of the dimer is a doublet with a splitting of 0.19(3) eV. This splitting can be associated with the cofacial HOMO‐HOMO Pc‐Pc interaction and translates into a tight‐binding bandwidth in the polymer of 0.38(6) eV. This result is in good agreement with an experimental bandwidth of 0.48(5) eV obtained from a Drude analysis of the {[Ge(Pc)0]I1.1}nreflectance spectrum and a bandwidth of 0.50 eV derived from theoretic

ISSN:0021-2148    

DOI:10.1002/ijch.198600052

出版商:WILEY‐VCH Verlag    

年代:1986

数据来源: WILEY