Syntheses and crystal structures of straight or zigzag one-dimensional coordination polymers based on Cu(II) square pyramidal or Cu(I) tetrahedral coordination environments |
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| Authors: | Kazuhiro Uemura Akihisa MaedaHidetoshi Kita |
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| Affiliation: | Environmental Science and Engineering, Graduate School of Science and Engineering, Yamaguchi University, Tokiwadai 2-16-1, Ube-shi, Yamaguchi 755-8611, Japan |
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| Abstract: | Two coordination polymers containing copper ions, [Cu(SO4)(pyz)(H2O)]n (1) and [Cu2(SO4)(pyz)2(H2O)2]n (2) (pyz = pyrazine), have been synthesized and characterized by single-crystal X-ray analyses. Compound 1 was synthesized by the reaction of Cu(SO4) · 5H2O with pyz (ratio = 1:2) in H2O at room temperature. The structure of 1 consists of linear chains of [Cu(pyz)(H2O)]2+, with coordinated sulfate ions bridging the chains. Compound 2 was obtained as dark red blocks from the reaction of Cu(SO4) · 5H2O and pyz (ratio = 1:2) in H2O, after heating to 180 °C in a Teflon autoclave for 48 h. The structure of 2 consists of zigzag chains of [Cu(pyz)(H2O)]+ with sulfate ions. Only the difference in the synthesis temperature, room temperature or 180 °C, determines whether Cu(II) or Cu(I) coordination polymers are formed, with the reduction of Cu(II) to Cu(I) being explained by the Gillard mechanism. |
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| Keywords: | Copper Pyrazine Coordination polymer Crystal structure Solvothermal synthesis Reduction |
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