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  • 1
    Electronic Resource
    Electronic Resource
    DCNQI Anion-Radical Salts with Bisammonium Cations (1998)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1998 (1998), S. 1653-1660 
    Details
    ISSN: 1434-193X
    Keywords: Conducting materials ; Radical ions ; Crystal structures ; Electrochemistry ; Dications ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Radical-anion salts have been prepared by electro-crystallization from seven 2,3- and 2,5-disubstituted DCNQIs and the quaternary dications (AMM2+) HMED, DMBP, EBP, and EBBT. The black compounds adopt the stoichiometry DCNQI/dication = 3:1. The crystal-structure analysis of two of these radical salts reveal skewed (zigzag, trimerized) stacks of DCNQI molecules separated by sheets of dications. Specific interactions between DCNQI anions and dications are absent. The effect on the stacking of the DCNQI units of the two positive charges in the dications which are held apart at a defined separation is discussed. The salts are shown to be semiconductors with powder conductivities of 10-2 to 10-5 S cm-1.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Coordination Polymers, 13. Induction of Helicity via Stereogenic Centers: Asymmetric Synthesis of (P)- and (M)-Coordination PolymersDedicated to Professor Wolfgang Beck on the occasion of his 65th birthday. (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 1309-1313 
    Details
    ISSN: 0009-2940
    Keywords: Asymmetric induction ; Helical structures ; Coordination polymers ; Copper ; Crystal structures ; Clathrates ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of a methanolic copper(II) acetate solution of enantiomerically pure (5R)-/(4S)-methyl E-(4-ethyl-2-oxazolidinylidene)cyanoacetate 6 leads to the mononuclear chelate complexes (R, R)-/ (S, S)-7. Recrystallization of (R, R)-/(S, S)-7 from non-coordinating chloroform and asymmetric induction via the stereogenic centers, originating from (R)-/(S)-6, stereospecifically yield the right- and left-handed helical ID-coordination polymers (P)-/(M)-8. The structures of mononuclear complex (R, R)-7 and of helix (P)-8 and its mirror image (M)-8 have been characterised unequivocally by X-ray crystal structure analyses. (P)- and (M)-8 crystallize with chloroform to give the clathrates 1.{[CuLR2]. 2 CHCl3} and 1.{[CuLS2].2CHCl3}, respectively.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971300921
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