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

• Published in: Journal of coordination chemistry 2010-10, Vol.63 (19), p.3441-3452
• Main Authors: Liang, Shengli, Liu, Zhiliang, Liu, Naren, Liu, Caiming, Di, Xiaowei, Zhang, Jun
• Format: Article
• Language: English
• Subjects: Binuclear complex; Crystal structure; Magnetic properties
• ISSN: 0095-8972; 1029-0389
• DOI: 10.1080/00958972.2010.512386

Polydentate ligands 2-[(2-hydroxypropylimino)methyl] phenol (L) and pyridine-2,6-dicarboxylic acid (H 2 pda) have been used in the synthesis of binuclear transition metal complexes. A new doubly end-on azido-bridged binuclear nickel(II) complex with formula [ (µ 1,1 -N 3 ) 2 (L) 2 (N 3 ) 2 ] · H 2 O (1) and a bis-µ-hydroxo-bridged dinuclear chromium(III) complex with the formula [ (OH) 2 (pda) 2 (H 2 O) 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 based on the Hamiltonian Ĥ = −2JŜ 1 Ŝ 2 − D( + ) − gβH(Ŝ 1 + Ŝ 2 ). Compound 2 displays intramolecular intermetallic antiferromagnetic coupling with J = −6.56 cm −1 based on the Hamiltonian Ĥ = −2JŜ 1 Ŝ 2 − j(Ŝ 1 Ŝ 2 ) 2 .