e.s.r. spectrometer affords (a) the persistent (t½ 5 min—3 months at 25° C) metal-centred radical Ṁ(NR1R2)3[(i) R1= SiMe3, R2= But, M = Ge or Sn; (ii) R1= R2= SiMe3 or GeMe3, M = Ge or Sn; or (iii) R1= R2= GeEt3, M = Sn], (b) a lead mirror (for the lead amides), or (c) no sign of reaction (for the more bulky diamides). E.s.r. parameters have been derived from the isotropic spectra.
一系列通式为M(NR 1 R 2)2 [(i)R 1 = SiMe 3,R 2 = Bu t的亚4B族
金属酰胺。M = Ge,Sn或Pb; (ii)R 1= R 2= SiMe 3;M = Ge,Sn或Pb; 和(iii)R 1 = R 2 = GeMe 3,SiEt 3或GePh 3 ; M = Ge或Sn]是由适当的
氨基
锂和
金属制得的(II)卤化物。在环境条件下,酰胺为浅黄色至红色,热致变色,抗磁性,低熔点的固体或液体,可溶于其中为抗磁性单体的烃(C 6 H 6或C 6 H 12)中。较低的同源物使母体分子离子成为最高的m / e物种。红外光谱在380-430厘米显示一个带-1 [ ν ASYM(MN 2)]和1 H或13 C NMR光谱与弯曲的单制剂是一致的。在可见区域,化合物显示中等强度(μ= 600–2050 dm 3的谱带(364–495 nm)3mol –1 cm –1 in