The title compound, [H2[graphic omitted]NLi]3·PMDETA}n, (1)(PMDETA = pentamethyldiethylenetriamine), is shown to be the first example of an organonitrogen–lithium laddered structure, consisting in the solid (n= 2) of two attached (NLi)2 rings, or alternatively four (N–Li) rungs, with two terminal NLi units complexes by PMDETA, so preventing further association; cryoscopic and 7Li n.m.r. spectroscopic studies imply that extension of the ladder framework can occur in arene solutions of (1), and these results, together with those from ab initio m.o. calculations on model systems, suggest that similar compounds of type (RR′NLi·xdonor)n, but of various ladder lengths, should be preparable.
标题化合物[H2[graphic omitted]NLi]3·
PMDETA}n(1)(
PMDETA = pentamethyldiethylenetriamine)被证明是有机氮-
锂阶梯结构的第一个例子,由两个相连的(NLi)2环或四个(N-Li)梯级组成的固体(n=2)组成,其中两个终端NLi单元通过
PMDETA复合,从而防止进一步的结合;低温和7Li n.m.r.光谱研究表明,阶梯框架的延伸可能发生在(1)的
芳烃溶液中,这些结果以及模型系统从头算m.o.计算的结果表明,类似(RR'NLi·xdonor)n类型的化合物,但具有不同的阶梯长度,应该可以制备。