Synthesis and characterisation of pendant-arm alcohol derivatives of [9]aneN2S and complexation with CuII ([9]aneN2S = 1-thia-4,7-diazacyclononane) †
作者:Alexander J. Blake、Jonathan P. Danks、Andrew Harrison、Simon Parsons、Paul Schooler、Gavin Whittaker、Martin Schröder
DOI:10.1039/a801552j
日期:——
An improved detosylation of 4,7-bis(tolyl-p-sulfonyl)-1-thia-4,7-diazacyclononane to give the free amine [9]aneN2S has been accomplished using Li/NH3 or HBr/acetic acid. Reaction of [9]aneN2S with ethylene oxide, 1,1-dimethylethylene oxide and methylenecyclohexane oxide in alcoholic solution affords the potentially pentadentate ligands 4,7-bis(hydroxyethyl)-1-thia-4,7-diazacyclononane (H2L1), 4,7-bis(2-hydroxy-2-methylpropyl)-1-thia-4,7-diazacyclononane (H2L2) and 4,7-bis(2-cyclohexyl-2-hydroxymethyl)-1-thia-4,7-diazacyclononane (H2L3) respectively. The copper(II) complexes of these ligands have been prepared and reveal that increasing the steric bulk on the pendant arm has a marked effect upon the resultant co-ordination chemistry. Thus, the complex of H2L1 shows a dimeric structure [Cu2(HL1)2][PF6]2 1 in which one of the hydroxy groups has been deprotonated. With H2L2 two complexes can be isolated: the dimer [Cu2(HL2)2][PF6]2 2 and the monomer [Cu(HL2)][PF6] 3. In contrast, with H2L3 only the monomer [Cu(HL3)][PF6] 4 could be isolated. Single crystal structures of 1 and 3 have been determined. Magnetochemistry of 1 indicates that the two copper(II) centres are essentially non-coupled.
使用 Li/NH3 或 HBr/乙酸对 4,7-双(甲苯对磺酰基)-1-硫杂-4,7-二氮杂环壬烷进行了改进的脱甲基化反应,得到了游离胺 [9]aneN2S。在酒精溶液中,[9]aneN2S 与环氧乙烷、1,1-二甲基环氧乙烷和亚甲基环己烷的反应生成了潜在的五配位体 4,7-双(羟乙基)-1-硫杂-4,7-二氮杂环壬烷、7-二氮杂环壬烷(H2L1)、4,7-双(2-羟基-2-甲基丙基)-1-硫杂-4,7-二氮杂环壬烷(H2L2)和 4,7-双(2-环己基-2-羟甲基)-1-硫杂-4,7-二氮杂环壬烷(H2L3)。这些配体的铜(II)配合物的制备结果表明,增加垂臂上的立体容积对由此产生的配位化学反应有明显的影响。因此,H2L1 的配合物显示出一种二聚结构 [Cu2(HL1)2][PF6]2 1,其中一个羟基已被去质子化。H2L2 可以分离出两种配合物:二聚体 [Cu2(HL2)2][PF6]2 2 和单体 [Cu(HL2)][PF6] 3。相比之下,H2L3 只能分离出单体 [Cu(HL3)][PF6] 4。1 和 3 的单晶结构已经确定。1 的磁化学性质表明,两个铜(II)中心基本上没有耦合。