The crystal structures determined for [Zn2L1(acac)]·H2O and [Zn2L2(acac)]·H2O·MeCN·MeOH show that both compounds are chiral, although crystallising as racemates. This was not unexpected, as these complexes had been designed on the basis of the coordinating behaviour of acac in combination with 2-(2-hydroxyphenyl)-1,3-bis[4-(2-hydroxyphenyl)-3-azabut-3-enyl]-1,3-imidazolidine (H3L1) and 2-(5-bromo-2-hydroxyphenyl)-1,3-bis[4-(5-bromo-2-hydroxyphenyl)-3-azabut-3-enyl]-1,3-imidazolidine (H3L2). The reactivity of Zn(acac)2·nH2O with compartmental H3Lx (x = 1 or 2) has been investigated under different reaction conditions. Thus, depending on the temperature, the reaction with H3L1 can yield [Zn2L1(acac)]·H2O or [Zn2L1(OAc)]·H2O, whilst the interaction of Zn(acac)2·nH2O with H3L2 only gives rise to crystalline [Zn2L2(acac)]·H2O·MeCN·MeOH. This latter species loses the most volatile solvates on drying to yield [Zn2L2(acac)]·H2O. Both [Zn2Lx(acac)]·H2O complexes have been fully characterised by analytical and spectroscopic methods.
为[Zn2L1(acac)]-
H2O 和[Zn2
L2(acac)]- -MeCN-MeOH 确定的晶体结构显示,这两种化合物都是手性的,尽管结晶为外消旋体。这并不出乎意料,因为这些配合物是根据 acac 与 2-(2-羟基苯基)-1,3-双[4-(2-羟基苯基)-3-氮杂丁-3-烯基]-1,3-
咪唑烷 (H3L1) 和 2-(5-
溴-2-羟基苯基)-1,3-双[4-(5-
溴-2-羟基苯基)-3-氮杂丁-3-烯基]-1,3-
咪唑烷 (H3
L2) 的配位行为设计的。在不同的反应条件下,研究了 Zn(acac)2-n 与隔室 H3Lx(x = 1 或 2)的反应性。因此,根据温度的不同,与 H3L1 的反应可以产生 [Zn2L1(acac)]- 或 [Zn2L1(OAc)]- ,而 Zn(acac)2-n 与 H3
L2 的相互作用只产生结晶的 [Zn2
L2(acac)]- -MeCN-MeOH。后一种物质在干燥时会失去最易挥发的溶胶,生成[Zn2
L2(acac)]- 。这两种[Zn2Lx(acac)]- 复合物都已通过分析和光谱方法进行了全面表征。