Synthesis and co-ordination chemistry of new Schiff-base bis(crown ether) ligands containing recognition sites for alkali- and transition-metal guest cations. Crystal structure of a copper(<scp>I</scp>)–potassium complex
作者:Paul D. Beer、Christopher G. Crane、Michael G. B. Drew
DOI:10.1039/dt9910003235
日期:——
Schiff-base bis(crown ether) ligands L1–L5 containing recognition sites for alkali- and transition-metal guest cations have been prepared by the condensation of two equivalents of 15-formyl-2,3,5,6,8,9,11,12-octahydro-1,4,7,10,13-benzopentaoxacyclopentadecine with diamines H2NXNH2(X =[CH2]2S[CH2]2, [CH2]2S[CH2]2S[CH2]2, [CH2]2S[CH2]3S[CH2]2, [CH2]3S[CH2]2S[CH2]3 or [CH2]2NH[CH2]2). The sodium cation forms
通过缩合两个当量的15-甲酰基-2,3,5,6,8,制备了新的席夫碱双(冠醚)配体L 1 -L 5,其中包含碱金属和过渡金属客体阳离子的识别位点与二胺H 2 NXNH 2(X = [CH 2 ] 2 S [CH 2 ] 2,[CH 2 ] 2 S [CH 2 ] 2 S [CH 2 ] 2,[CH 2 ] 2 S [CH 2 ] 3 S [CH 2 ]2,[CH 2 ] 3 S [CH 2 ] 2 S [CH 2 ] 3或[CH 2 ] 2 NH [CH 2 ] 2)。钠阳离子形成2:1 Na +:L络合物,而较大的钾阳离子与这些配体产生1:1分子内夹心复合物。还分离了均金属铜( I)络合物和杂多金属铜( I)-钠和-钾络合物。已经确定了一种铜-钾配合物的单晶X射线结构。Heteropolymetallic银(我也已制备了钠和钾配体。碳13 NMR滴定研究表明,席夫碱双(冠醚)配体对钾客体