Supramolecular hydrogen-bonded frameworks from 6-phosphonopyridine-2-carboxylic acid and transition metal ions
Academic Article
Overview
Research
Identity
Additional Document Info
Other
View All
Overview
abstract
Hydrothermal reactions of 6-phosphonopyridine-2-carboxylic acid (H 3L) with divalent transition metal perchlorates (Cu, Co, Ni) afforded three new organic-inorganic hybrids, namely, [Cu(C6H 4NO5P)2]3(H2O), 1, [Co-(C6H4NO5P)(H2O) 3]H2O, 2, and [Ni(C6H 3NO5P)0.5Ni(H2O)6] 2H2O, 3. The ligand crystallizes in the monoclinic space group P21/c with a = 8.483(1) , = 12.478 (2) , c = 8.512(1), = 110.844(3), V = 842.0(2) 3, and Z = 4. A pair of hydrogen bonds N-HO running through the a-axis link the neighboring molecules forming dimers continuing into a two dimensional (2D) network with the aid of lattice water in the a direction. Compound 1 crystallizes in the monoclinic space group P21/c with a = 8.123(5) , b = 14.912 (1) , c = 15.508(1), = 100.571(1), V = 1846.8(2) 3, and Z = 4. The structure of compound 1 features a 2D hydrogen-bonding framework. Compound 2 crystallizes in the triclinic space group P1 with a = 7.292(4) , b = 8.255(4) , c = 10.055(5) , = 97.328(8), = 100.571(1), = 100.293(9), V = 590.3(5) 3, and Z = 2. The structure of compound 2 features a channel 8 x 7 formed by hydrogen bonding along the a-axis through a pair of POH-OOC and two pairs of HOH-OP=O(OH) hydrogen bonds. Compound 3 crystallizes in the orthorhombic space group Pbca with a = 19.592(2) , b = 7.222(8) , c = 25.516(2), V = 3676.6(6) 3, and Z = 8. The structure features both a nickel cation and a complex anion. The three dimensional (3D) hydrogen-bonding framework is observed down the b-axis direction and running through the ac-plane to form infinite chains. 2005 American Chemical Society.
