Conformation preference of a flexible cyclohexanetetracarboxylate ligand in three new metal-organic frameworks: structures, magnetic and luminescent properties.

ABSTRACT: Three novel complexes of formula [Co(5)(OH)(2)(cht)(2)(H(2)O)(10)](n) x 2nH(2)O (1) (H(4)cht = cyclohexane-1,2,4,5-tetracarboxylic acid), [Zn(2)(cht)(H(2)O)(3)](n) x nH(2)O (2), and [Cd(2)(cht)(H(2)O)(5)](n) x 2nH(2)O (3) were synthesized by a hydrothermal reaction of cyclohexane-1,2,4,5-tetracarboxylic acid in the presence of sodium hydroxide with Co(NO(3))(2) x 6H(2)O, Zn(NO(3))(2) x 6H(2)O, and Cd(NO(3))(2) x 4H(2)O, respectively. These complexes were obtained by controlling the molar ratios of starting materials and the pH values of reaction mixtures with an initial pH of 5.87 for 1, 5.50 for 2, and 5.57 for 3, respectively. The single-crystal X-ray investigations reveal that the cht ligands change their conformations exclusively to the a,e,e,a form in all three complexes. Complex 1 fe

SUBMITTER: Wang R 

PROVIDER: S-EPMC2760471 | biostudies-literature | 2009 Aug

REPOSITORIES: biostudies-literature