ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Construction and Structure of Coordination Polymers Based on Tetrahedral Cu₄OBr₆ Centres Linked by Pyrazine

G. Ondrejovič, A. Broškovičová, and A. Kotočová

Department of Inorganic Chemistry, Faculty of Chemical Technology, Slovak University of Technology, SK-812 37 Bratislava

Abstract: A model of 1D-, 2D-, and 3D-frameworks constructed of tetrahedral centres linked by rod-like ligands according to the regularities given by diamond and lonsdaleite lattices has been developed. The composition of the SD-framework polymer is expressed by the formula O_chs b_{[2chs-0.5(ch+cs)-hs]} t_[c(h+s)+2hs], where c, h, and s represent the numbers of the tetrahedral centres O in three different dimensions of the SD-framework, b and t denote the relative amounts of bridging and terminal rod-like ligands, respectively. For related sheet and chain polymers the formulas O_ch b[_{1.5ch-0.5c-h]} t_[ch+c+2h] and O_c b_[c-1] t_[2c+2] have been derived, respectively. The formulas have been applied to a series of synthesized Cu₄OBr₆(pyz)_p (p = 2.25-3.95) complexes in order to describe their structure. The complex with the value of p = 3.17 consists of chains comprising about 6 linked tetrahedral Cu₄OBr₆ centres. The values of p = 3.04 and 2.90 correspond to sheet structures with 9 and 16 linked centres, respectively. The structures of the complexes with p = 2.41 and 2.25 consist of 3D-frameworks. For the former complex 124 and for the latter one 503 linked tetrahedral Cu₄OBr₆ centres have been estimated.

Full paper in Portable Document Format: 541a6.pdf

Chemical Papers 54 (1) 6–11 (2000)