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Mixed-ligand copper(II) complexes with N-methyl derivatives of iminodiacetato or imidazole: crystal structures of (N-methyl-iminodiacetato)(imidazole)copper(II), [Cu(MIDA)(ImH)] and diaqua(iminodiacetato)(N-methyl-imidazole)copper(II) monohydrate, [Cu(IDA)(1MeImH)(H2O)2].H2O

Equimolar (1:1:1) mixed-ligand Cu(II) complexes with iminodiacetato (IDA) or N-methyl-IDA (MIDA) and N-methyl-imidazole (1MeImH) or ImH, respectively, have been prepared and characterized by thermal, spectral, magnetic and X-ray diffraction methods. [Cu(MIDA)(ImH)](I) crystallizes in themonoclinic system P21/n (a = 12.465(3), b = 5.999(1), c = 14.733(3).ANG ., beta = 111.91(1)¡ã, Z = 4, R = 0.043, Rw = 0.047). The Cu(II)atom exhibits a flattened square base pyramidal coordination (type 4+1) . The N and two O atoms of the tridentate MIDA and one N of ImH form thesquare base; one longer Cu-O bond with the next MIDA ligand in the chai n complex completes the Cu(II) five-coordination. [Cu(IDA)(1MeImH)(H2O)2]. H2O (II) crystallizes in the orthorhombic system Pna21 (a = 14.733(2), b = 7.721(1), c = 11.288(1)A, Z = 4, R = 0.041, Rw = 0.043). The Nand two O atoms from IDA and one N from 1MeImH define a square coordina tion; two longer Cu-OH2 bonds complete the unsymmetrical elongated octahedral coordination of Cu(II) (type 4+1+1). The polar N-H bonds of ImH inI and of IDA in II as well as the O-H bonds of the water molecules of t he latter compound are involved in hydrogen bonds. The stepwise water loss in II is explained on the basis of its structural role in the Cu(II) coordination and/or in the crystal packing.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI