Structural determinations and magnetic studies of two new binuclear complexes: azido-bridged Ni(II) dimer and di-(μ-hydroxo)-bridged Cr(III) dimer

摘要

Polydentate ligands 2-[(2-hydroxypropylimino)methyl] phenol (L) and pyridine-2,6-dicarboxylic acid (H_2pda) have been used in the synthesis of binuclear transition metal complexes. A new doubly end-on azido-bridged binuclear nickel(H) complex with formula [Ni~(21)_2(μ_(1,1)-N_3)_2(L)_2(N_3)_2] · H_2O (1) and a bis-μ-hydroxo-bridged dinuclear chromium(III) complex with the formula [Cr~(12)~(II)(OH)_2(Pda)_2(H_2O)_2] (2) have been synthesized and characterized by single crystal X-ray diffraction and magnetic studies. Compound 1 displays intramolecular intermetallic ferromagnetic coupling with J= 28.32 cm~(-1) and D= -19.30 cm~(-1) .and D= -19.30 cm~(-1) based on the Hamiltonian H=-2JS_1S_2 -D (S~2_(Iz) +S~2_(2z) gbH(S_1+S_2).Compound 2 displays intramolecular intermetallic antiferromagnetic coupling with J= -6.56 cm~(-1) based on the Hamiltonian H= -2JS_1 S_2 -j(S_1 S_2)_2.