Abstract
Coordination polymers, {[Cd(2-mBIM)3](ClO4)2} n (1) and [Cd(BIM)2(NO3)2] n (2), have been prepared from the reaction of bis(2-methylimidazol-1-yl)methane(2-mBIM) with Cd(ClO4)2 and bis(imidazol-1-yl)methane (BIM) with Cd(NO3)2 in ethanol and water, respectively. Their structures were characterized by single crystal X-ray diffraction and IR spectroscopy. Compound 1 crystallizes in the rhombohedral space group R-3c with a = b = 12.3617(5) Å, c = 38.896(3) Å, γ = 120°, V = 5147.5(5) Å3, z = 6. The CdII occupies a crystallographic inversion center and is coordinated by six N atoms from six distinct 2-mBIM ligands to form a slightly distorted octahedral geometry. Each 2-mBIM is coordinated to two CdII cations, linking alternatively four CdII cations, resulting in a 32-membered M4L4 macrometallacycle. Compound 2 crystallizes in the monoclinic space group C2/m with a = 14.400(3) Å, b = 9.3894(18) Å, c = 8.6926(17) Å, β = 123.499(2)°, V = 980.1(3) Å3, z = 2. The Cd coordinates to four nitrogen atoms from four different BIM and two nitrates to form a slightly distorted octahedral geometry. The BIM ligands bridge to form a 1-D infinite double-bridged chain structure with 16-membered M2L2 macrometallacyclic structural units.
Acknowledgements
This work was financially supported by the Natural Science Funds for Distinguished Young Scholars of Hubei Province, P.R. China (Grant No. 2006ABB038), the outstanding Mid-young Scholars’ Science and Technology Programs, Hubei Provincial Department of Education (2007B003) and The Project sponsored by SRF for ROCS, SEM (200724).