Syntheses, characterizations, and crystal structures of 3d–s/d10 metal complexes derived from two compartmental Schiff base ligands

Abstract

The present investigation reports the syntheses, characterizations, and crystal structures of nine copper(II)/nickel(II)–s/d10 complexes, [CuIIL1NaI(ClO4)(CH3CN)] (1), [CuIIL1KI(ClO4)(CH3COCH3)] (2), [CuIIL2ZnIICl2]·CH3CN (3), [(CuIIL2)2NaI](ClO4)·CH3COCH3 (4), [(NiIIL1)2KI](ClO4) (5), [(CuIIL1)2CsI(ClO4)]·2CH3CN (6), [(NiIIL1)2CsI(ClO4)]·2H2O (7), [(CuIIL2)2SrII(H2O)2](NO3)2 (8), and [{CuIIL2LiI(H2O)}2(μ-H2O)](ClO4)2 (9), where H2L1 and H2L2 are two 3-methoxysalicylaldehyde-diamine (H2LOMe) ligands in which the diamine moieties are o-phenylenediamine and trans-1,2-diaminocyclohexane, respectively. Among these nine compounds, three (1, 2, and 3) are dinuclear, five (4, 5, 6, 7, and 8) are trinuclear, and 9 is tetranuclear. Trinuclear 6 and 7 are double-decker sandwich systems. Some (in 3 and 9) or all (in 1, 2, and 4–8) of the four oxygens of the O(phenoxo)2O(methoxy)2 compartment(s) are coordinated to the second metal ion (NaI in 1 and 4, KI in 2 and 5, ZnII in 3, CsI in 6 and 7, SrII in 8, and LiI in 9). The di/tri/tetranuclear molecules in 2–9 are self-assembled by weak attractions, such as hydrogen bonds/cation (KI) π/C–H π interactions. The following self-assemblies are observed: 1-D in 3, 7, and 9, 1-D ladder in 4, 2-D in 8, and 3-D in 2 and 5.