Low-co-ordination arsenic and antimony compounds: synthesis and characterisation of 2-arsa- and 2-stiba-1,3-dionatolithium(I) complexes, [Li{OC(R)EC(R)O}L](E = As or Sb; R = But, C6H2Pri 3-2,4,6 or C6H2But 3-2,4,6; L = Et2O or MeOCH2CH2OMe)
作者:Julie Durkin、David E. Hibbs、Peter B. Hitchcock、Michael B. Hursthouse、Cameron Jones、Joanne Jones、K. M. Abdul Malik、John F. Nixon、Glenn Parry
DOI:10.1039/dt9960003277
日期:——
Reactions of [LiE(SiMe3)2}(dme)](E = As or Sb, dme = MeOCH2CH2OMe), with a range of acid chlorides, RCOCl, afforded the novel 2-arsa-1,3-dionatolithium(I) complexes [[graphic omitted]}L](R = But, L =½ dme or Et2O; R = C6H2Pri3-2,4,6, L = Et2O; R = C6H2But3-2,4,6, L = dme), and the first example of a 2-stiba-1,3-dionatolithium(I) complex [[graphic omitted]}(dme)0.5]2}∞]. X-Ray crystal structural analyses for the complexes with R = But, L =½ dme or Et2O and the antimony compound show them to be dimeric in the solid state with respect to the metal and anionic ligands, the dimeric units being linked in an infinite polymeric chain by bridging dme molecules or solvated with Et2O. A dimeric structure can also be inferred when R = C6H2Pri3-2,4,6, L = Et2O. In solution these four compounds display fluxional behaviour. Treatment with HCl of the monomeric compound having R = C6H2But3-2,4,6, L = dme yields the known diacylarsane [AsC(C6H2But3-2,4,6)O}C(C6H2But3-2,4,6)OH}] the crystal structure of which reveals the enol form with the alcoholic proton intramolecularly hydrogen bonded to the opposing oxygen centre of the ligand.
[LiE(SiMe3)2}(dme)](E = As或Sb,dme = MeOCH2CH2OMe)与一系列酰氯RCOCl的反应产生了新型2-arsa-1,3-dionatolithium(I)配合物[[图形省略]}L](R = But,L =½ dme或Et2O;R = C6H2Pri3-2,4,6,L = Et2O;R = C6H2But3-2,4,6,L = dme),以及第一个2-stiba-1,3-dionatolithium(I)配合物[[图形省略]}(dme)0.5]2}∞]。对R = But、L =½ dme或Et2O的配合物以及锑化合物的X射线晶体结构分析表明,它们在固态下与金属和阴离子配体形成二聚体,二聚体单元通过桥连的dme分子连接成无限聚合物链,或与Et2O溶剂化。当R = C6H2Pri3-2,4,6,L = Et2O时,也可以推断出二聚体结构。在溶液中,这四种化合物表现出流动性。用HCl处理具有R = C6H2But3-2,4,6,L = dme