Abstract |
The synthesis, structure, magnetic and electrochemical properties of the heterobridged mu-phenoxido-mu(1,1)-azide dinickel-(II) compound [Ni-2(II)(HL1)(3)(mu-(1,1)-N-3)]center dot 3H(2)O (1) derived from the tetradentate Schiff base ligand N-(2-hydroxyethyl)-3-methoxysalicylaldimine (H2L1) are described. The title compound crystallizes in the triclinic system (space group P (1) over bar). Electrochemical analyses reveal that compound 1 exhibits two-step quasireversible couples in the reduction window with E-1/2 values of -1412 and -1762 mV. The variable-temperature (2-300 K) magnetic susceptibilities at 1 T of the title compound were measured. The interaction between the metal centres is weak ferromagnetic (J = 5.0 cm(-1), g = 2.23, D-1 = 29.2 cm(-1) and D-2 = 10.7 cm(-1)). Comparison of the exchange integral of 1 with that of the only reported mu-phenoxido-mu(1,1)-azide dinickel(II) compound results in the emergence of a unique example of the dependence of strength of magnetic exchange interaction on the metal-ligand bridge distance. ((C) Wiley-VCH Verlag GmbH \& Co. KGaA, 69451 Weinheim, Germany, 2009) |