Synthesis of a novel series of 6,6′-disubstituted 4,4′-bipyrimidines by radical anion coupling:: New π-accepting ligands for coordination chemistry
Synthesis of a novel series of 6,6′-disubstituted 4,4′-bipyrimidines by radical anion coupling:: New π-accepting ligands for coordination chemistry
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DOI：
10.1002/ejoc.200500335
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发表时间：
2005-08-26
影响因子：
2.8
通讯作者：
Hanan, GS
中科院分区：
文献类型：
--
作者：
Ioachim, E;Medlycott, EA;Hanan, GS
合成并表征了一类新的6，6 ′-二取代4，4 ′-联嘧啶配体。通过循环伏安法测定的新配体的还原电位表明，这些新配体是比普遍存在的2，2 '-联吡啶配体好得多的π-受体，并且甚至比母体未取代的4，4'-联嘧啶配体更上级。在4，4'-联嘧啶的6，6 '位上的取代基也引起在整个UV区域中的pi-> pi * 和n-> pi * 吸收的红移。双嘧啶家族的一个成员的X-射线晶体结构表明，在固态下，芳基取代基可以与嘧啶环共面。嘧啶环上的芳基取代基提供的额外的电子离域有助于这些化合物更好的π-接受能力。((c)Wiley-VCH Verlag GmbH & Co.KGaA，69451魏因海姆，德国，2005）。
A new family of 6,6'-disubstituted 4,4'-bipyrimidine ligands has been prepared and characterized. The reduction potentials of the new ligands, as determined by cyclic voltammetry, indicate that these new ligands are considerably better pi-acceptors than the ubiquitous 2,2'-bipyridine ligand, and are even superior to the parent unsubstituted 4,4'-bipyrimidine ligand. The substituents in 6,6' positions of the 4,4'-bipyrimidine also cause a red-shift in the pi ->pi* and n ->pi* absorptions throughout the UV region. The X-ray crystal structure of one member of the family of bipyrimidines demonstrates that the aryl substituents may lie coplanar with the pyrimidine rings in the solid state. The additional electron delocalization afforded by the aryl substituents on the pyrimidine rings contribute to the better pi-accepting ability of these compounds. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005).