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  • 1
    ISSN: 0044-2313
    Keywords: Nickel(0) ; binuclear compounds ; functionalized alkynes ; supramolecular structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Binuclear Nickel(0) Alkyne Coordination Compounds - Correlation between Ligand Periphery and Supramolecular StructureReaction of Ni(cdt: 1,5,9-cyclododecatriene) with functionalized alkynes and subsequent reaction with ethylenediamines gives binuclear compounds of the type (diamine)Ni(μ-alkyne)Ni(alkyne). Compounds with alkyne-diols (N⁁N)Ni2(HOR1R2C—C≡C—CR1R2OH)2 show supramolecular structures in which two identical intramolecular and one intermolecular hydrogen bonds are realized. 1 and 2 (chelate ligand in each case N,N,N′,N′-tetramethylethylenediamine, TMEDA, in 1 R1 = R2 = Me, in 2 R1 = R2 = Et) polymer-like chains are built up by connecting the binuclear units. Via two intermolecular hydrogen bonds per organometallic unit in 1 and via one intermoleculare hydrogen bond in 2 the chains are connected to give double chains. By substitution of one methyl group of TMEDA by hydrogen (3: R1 = R2 = Me) a polymerlike network is produced by connecting the polymer-like chains.In compound 4 in which one of the methyl groups of TMEDA is substituted by CH2CH2NMe2 the polymer-like chains remain unconnected. In 5 (diamine = TMEDA, alkyne = (CH3)3C—C≡C—CMe2OH) one intermolecular hydrogen bond per organometallic unit is observed forming again polymer-like chains that are independent of each other.
    Notes: Durch Reaktion von Ni(cdt) (cdt: Cyclododeca-1,5,9-trien) mit funktionalisierten Alkinen und anschließender Umsetzung mit Ethylendiaminen erhält man binucleare Alkin-Nickel(0)-Verbindungen des Typs (diamin)Ni(μ-alkin)Ni(alkin). In Verbindungen mit Alkindiolen (N ⁁ N)Ni2(HOR1R2C—C≡C—CR1R2OH)2 werden supramolekulare Strukturen aufgebaut, die jeweils zwei gleichartige intramolekulare und eine intermolekulare Wasserstoffbrückenbindung aufweisen. In 1 und 2 (Chelatligand jeweils N,N,N′,N′-Tetramethylethylendiamin, TMEDA, in 1 R1 = R2 = Me, in 2 R1 = R2 = Et) bilden sich durch Verknüpfung der binuklearen Einheiten polymere Stränge, die in 1 durch zwei und in 2 durch eine Wasserstoffbrückenbindung pro Organometalleinheit zu Doppelsträngen verknüpft werden. Ersatz einer Methylgruppe in TMEDA durch Wasserstoff (3: R1 = R2 = Me) bewirkt, daß die polymeren Stränge zu einem polymeren Netzwerk verknüpft werden. In Verbindung 4 (R1 = R2 = Me), in der im TMEDA eine Methylgruppe durch CH2CH2NMe2 ersetzt ist, bleiben die zu 1-3 analogen polymeren Stränge untereinander unverknüpft.In 5 (Diamin = TMEDA, Alkin = (CH3)3C—C≡C—CMe2OH) wird pro Organometalleinheit eine intermolekulare Wasserstoffbrückenbindung gebildet, was ebenfalls zu voneinander unabhängigen polymeren Strängen führt.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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