N-donor co-ligands driven two new Co(II)- coordination polymers with bi- and trinuclear units: Crystal structures, and magnetic properties.

Two new Co(II) coordination polymers(CPs), namely [Co 2 (bpe) 2 (Hbppc)] n ( 1 ) and [Co 3 (μ 3 -OH)(bppc)(bpm)(H 2 O)]·3H 2 O ( 2 ) (H 5 bppc=biphenyl-2,4,6,3′,5′-pentacarboxylic acid, bpe=1,2-bis(4-pyridyl)ethene, bpm=bis(4-pyridyl)amine), have been obtained and characterized by elemental analysis, single-crystal X-ray diffraction, powder X-ray diffraction (PXRD), IR spectra and thermogravimetric analysis (TGA). 1 shows a binodal (4,6)-connected fsc net with a (4 4 ·6 10 ·8)(4 4 ·6 2 ) topology, while 2 shows a binodal (5,7)-connected 3D network based on trinuclear [Co 3 (μ 3 -OH)] 5+ units with unusual (3.4 6 .5 2 .6)(3 2 .4 6 .5 7 .6 5 .7) topology. Variable-temperature magnetic susceptibility measurements reveals that complex 1 shows ferromagnetic interactions between the adjacent Co(II) ions, whereas 2 is a antiferromagnetic system. [ABSTRACT FROM AUTHOR]