Two New Helical Compounds Based on Pitch-Tunable Keggin Clusters

Two isostructural compounds, {[Cu2(DF)2H2O]2SiW12O40}·2H2O (1) and {[Cu2(DF)2H2O]2GeMo12O40}·2H2O (2) (DF = 4,5‐diazafluoren‐9‐one), were synthesized and characterized by routine methods and single‐crystal X‐ray diffraction. In the compounds, each Keggin cluster links five copper dimers [Cu2(DF)2H2O...

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Bibliographic Details
Published in:European Journal of Inorganic Chemistry 2009-12, Vol.2009 (34), p.5175-5180
Main Authors: Pang, Hai-jun, Zhang, Chun-jing, Peng, Jun, Wang, Yong-hui, Sha, Jing-quan, Tian, Ai-xiang, Zhang, Peng-peng, Chen, Yuan, Zhu, Min, Su, Zhong-min
Format: Article
Language:English
Subjects:
Electrochemistry
Helical structures
Luminescence
Polyoxometalates
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Summary:Two isostructural compounds, {[Cu2(DF)2H2O]2SiW12O40}·2H2O (1) and {[Cu2(DF)2H2O]2GeMo12O40}·2H2O (2) (DF = 4,5‐diazafluoren‐9‐one), were synthesized and characterized by routine methods and single‐crystal X‐ray diffraction. In the compounds, each Keggin cluster links five copper dimers [Cu2(DF)2H2O]2+ in an unusual asymmetrical pentacoordination mode to form 3D networks with left‐ and right‐handed helical chains. Notably, by comparing 1 and 2 with other helical compounds with Keggin clusters as connectors, we found that the pitches of those compounds are mainly dominated by the coordination modes of the Keggin clusters, suggesting that the Keggin clusters are pitch‐tunable synthons. Furthermore, the luminescent and electrochemical properties of the title compound were studied. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) Two new compounds possess the left‐ and right‐handed helical chains with Keggin polyoxometalates as connectors, whichverify the pitch tunableness of the Keggin polyoxometalates.
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.200900559