Biswas Chaitali, Drew Michael G B, Ghosh Ashutosh
Department of Chemistry, University College of Science, University of Calcutta, 92, A.P.C. Road, Kolkata-700 009, India.
Inorg Chem. 2008 Jun 2;47(11):4513-9. doi: 10.1021/ic8002542. Epub 2008 May 6.
Three heterometallic trinuclear Schiff base complexes, [{CuL1(H2O)}2Ni(CN)4].4H2O (1), [{CuL2(H2O)}2Ni(CN)4] (2), and [{CuL3(H2O)}2Ni(CN)4] (3) (HL1=7-amino-4-methyl-5-azahept-3-en-2-one, HL2=7-methylamino-4-methyl-5-azahept-3-en-2-one, and HL3=7-dimethylamino-4-methyl-5-azahept-3-en-2-one), were synthesized. All three complexes were characterized by elemental analysis, IR and UV spectroscopies, and thermal analysis. Two of them (1 and 3) were also characterized by single crystal X-ray crystallography. Complex 1 forms a hydrogen-bonded one-dimensional metal-organic framework that stabilizes a helical water chain into its cavity, but when any of the amine hydrogen atoms of the Schiff base are replaced by methyl groups, as in L2 and L3, the water chain vanishes, showing explicitly the importance of the host-guest H-bonding interactions for the stabilization of a water cluster.
合成了三种异金属三核席夫碱配合物，[{CuL1(H2O)}2Ni(CN)4]·4H2O (1)、[{CuL2(H2O)}2Ni(CN)4] (2) 和 [{CuL3(H2O)}2Ni(CN)4] (3)（HL1 = 7-氨基-4-甲基-5-氮杂庚-3-烯-2-酮，HL2 = 7-甲氨基-4-甲基-5-氮杂庚-3-烯-2-酮，HL3 = 7-二甲氨基-4-甲基-5-氮杂庚-3-烯-2-酮）。通过元素分析、红外光谱和紫外光谱以及热分析对这三种配合物进行了表征。其中两种（1和3）还通过单晶X射线晶体学进行了表征。配合物1形成了一个氢键连接的一维金属有机框架，该框架将螺旋水链稳定在其空腔中，但是当席夫碱的任何胺氢原子被甲基取代时，如在L2和L3中，水链消失，这明确显示了主客体氢键相互作用对于稳定水簇的重要性。
