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

The present investigation reports the syntheses, characterizations, and crystal structures of nine copper (II)/nickel(II)-s/d(10) complexes, [(CuLNaI)-L-II-Na-1(ClO4)(CH3CN)] (1), [(CuLKI)-L-II-K-1(ClO4)(CH3COCH3)] (2), [(CuLZnCl2)-L-II-Zn-2-Cl-II]center dot CH3CN (3), [((CuL2)-L-II)(2)Na-I](ClO4)center dot CH3COCH3 (4), [((NiL1)-L-II)(2)K-I](ClO4) (5), [((CuL1)-L-II)(2)Cs-I(ClO4)]center dot 2CH(3)CN (6), [((NiL1)-L-II)(2)Cs-I(ClO4)]center dot 2H(2)O (7), [((CuL2)-L-II)(2)Sr-II(H2O)(2)](NO3)(2) (8), and [{(CuLLiI)-L-II-Li-2(H2O)}(2)(mu-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, K-I in 2 and 5, Zn-II in 3, Cs-I in 6 and 7, Sr-II in 8, and Li-I in 9). The di/tri/tetranuclear molecules in 2-9 are self-assembled by weak attractions, such as hydrogen bonds/cation (K-I)center dot center dot center dot pi/C-H center dot center dot center dot pi 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.