Two layered gallophosphates assembled about the chiral metal complexes: Co(en)(3)center dot Ga3P4O16 center dot 5H(2)O and trans-Co(dien)(2)center dot Ga3P4O16 center dot 3H(2)O

摘要

Two new layered gallophosphates Co(en)(3)(.)Ga(3)P(4)O(16)(.)5H(2)O (1) and trans-Co(dien)(2)(.)Ga(3)P(4)O(16)(.)3H(2)O (2) have been hydrothermally synthesized using the racemic mixture of chiral metal complex Co(en)(3)Cl-3 and Co(dien)(2)Cl-3 as the structure-directing agent, respectively. Their structures are determined by single-crystal X-ray diffraction analysis and further characterized by X-ray power diffraction, ICP, elemental, and TG analyses. The structures of I and 2 consist of vertex-linking GaO4 and PO3(=O) tetrahedral units forming macroanionic [Ga3P4O16](3-) sheets with a 4.6-net. The 4.6-net is characteristic of chiral [3.3.3] propellane like structural motifs. The sheets of 1 stack in an ABAB sequence, with a pair of enantiomers of chiral Co(en 3 cations residing in the interlayer region. The sheets of 2 array in a helical fashion with an ABCDEF stacking sequence, with only one enantiomer of chiral Co(dien)(2)(3+) cations residing in the interlayer region. Structural elucidation of 1 and 2 reveals that there exist stereo-specific correspondence between the metal complex template and the structure of the inorganic host. Crystal data: 1, Co(en)(3)(.)Ga(3)P(4)O(16)(.)5H(2)O, orthorhombic, Pnna (No. 52), a = 8.6618(2) Angstrom, b = 21.6071(5) Angstrom, c = 13.7426(4) A, Z = 4, R-1 = 0.0337 (I > 2sigma(I)), wR(2) = 0.0985 (all data); 2, Co(dien)(2)(.)Ga(3)P(4)O(16)(.)3H(2)O, hexagonal, P6(5)22 (No. 179), a=8.5152(7)Angstrom, b = 8.5152(7)A, c = 63.278(8) Angstrom, R-1 = 0.1183 (I > 2sigma(I)), wR(2) = 0.2864 (all data) and Z = 6. (C) 2004 Elsevier Inc. All rights reserved.