کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1303029 | 974733 | 2010 | 4 صفحه PDF | دانلود رایگان |
Two new polyoxotungstates Na3H(C3H5N2)4[{Cu(C3N2H4)2}2Cu4(H2O)2(GeW9 O34)2]·27H2O (1) and Na10H8[Mn6Ge3W24O94(H2O)2]·37H2O (2) have been synthesized in aqueous solution. The polyoxoanion frameworks of the two compounds are built on the lacunary Keggin-type polyanion [GeW9O34]10−. The structure of compound 1 is a Weakley-type species capped by two [Cu(C3N2H4)2]2+ units through four bridging oxygen atoms on two opposite W4O4 faces. Compound 2 is a banana-shaped polyoxometalate consisting of two tri-Mn substituted [Mn3GeW9O34]4− Keggin units and a hexavacant bridging cluster [GeW6O26]12−. The magnetic investigations demonstrate the presence of both antiferromagnetic and ferromagnetic exchange interactions for 1 and weak antiferromagnetic interactions for 2.
Two new polyoxotungstates Na3H(C3H5N2)4[{Cu(C3N2H4)2}2Cu4(H2O)2(GeW9O34)2]·27H2O (1) and Na10H10[Mn6Ge3W24O94(H2O)2]·37H2O (2) have been synthesized. Complex 1 is a Weakley-type species capped by two [Cu(C3N2H4)2]2+ units on two opposite W4O4 faces, which is the first case of the copper(II)–imidazole fragment coordinated with four bridging oxygen atoms from sandwich-type polyoxotungstogermanates. Complex 2 is a banana-shaped POM consisting of two tri-Mn substituted [Mn3GeW9O34]4− Keggin units and a hexavacant bridging cluster [GeW6O26]12−.Figure optionsDownload as PowerPoint slide
Journal: Inorganic Chemistry Communications - Volume 13, Issue 3, March 2010, Pages 372–375