Synthesis and characterization of two cobalt complexes derived from the system containing phenylphosphonic acid

✍ Scribed by Mei Wang; Cheng-Bing Ma; Chang-Neng Chen; Qiu-Tian Liu

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 618 KB
• Volume: 891
• Category: Article
• ISSN: 0022-2860
• DOI: 10.1016/j.molstruc.2008.03.055

✦ Synopsis

A single-chain cobalt phosphonate complex [Co(phen)(4,4 0 -bpy)(PhPO 3 H) 2 ] n Á0.5H 2 O 1 (phen = 1,10-phenanthroline, 4,4 0 -bpy = 4,4 0 -bipyridine) and a mononuclear cobalt complex [Co(pic) 2 (H 2 O) 2 ]Á0.5H 2 O 2 (picH = picolinic acid) have been synthesized with identical procedure from similar system containing phenylphosphonic acid and N-containing ligands. Both complexes have been characterized by single crystal X-ray diffraction, IR spectroscopy, magnetic measurement and thermal analysis. Compound 1 crystallizes in the tetragonal system with a P4 3 2 1 2 space group, and exhibits a 1-D cobalt chain connected by 4,4 0 -bpy bridges propagated along a axis direction, and the chains are linked by strong hydrogen bonds to form a two-dimensional grid like coordination network, whereas compound 2 crystallizes in the monoclinic system with space group P2 1 /n, and the mononuclear molecules in 2 are linked by hydrogen bonds to form infinite double-chains and the double-chains are further crosslinked to create a twodimensional supramolecular network. The magnetic measurement reveals overall weak antiferromagnetic exchange interactions between the cobalt ions in both complexes 1 and 2.