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Tytuł:
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Syntheses, structures, and properties of two new hybrid Dawson-based polyoxotungstates [Mn(2,2'-bipy)3]H2 [Mn(2,2'-bipy)2][P2W18O62] and [Co(H2biim)3)]2H2[P2W18O62] · 8H2O.
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Autorzy:
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Wu, Qiang
Fu, Xiao
Zhao, Junwei
Li, Suzhi
Wang, Jingping
Niu, Jingyang
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Temat:
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TUNGSTATES
PYRIDINE
PHOTOLUMINESCENCE
ANIONS
HYDROGEN bonding
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Źródło:
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Journal of Coordination Chemistry; Jun2010, Vol. 63 Issue 11, p1844-1855, 12p, 4 Diagrams, 4 Charts
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Two new hybrid Dawson-based polyoxotungstates, [Mn(2,2'-bipy)3]H2[Mn(2,2'-bipy)2][P2W18O62] (1) and [Co(H2biim)3)]2H2[P2W18O62] · 8H2O (2) (2,2'-bipy = 2,2'-bipyridine, H2biim = 2,2'-biimdazole), have been prepared under hydrothermal conditions and characterized by single-crystal X-ray diffraction, elemental analyses, IR spectra, thermogravimetric analyses (TGA), X-ray photoelectron spectroscopy (XPS), and photoluminescence spectra. Compound 1 is a 1-D zigzag chain constructed from alternate Dawson-type heteropolyanions [α-P2W18O62]6- and metal coordination cations [Mn(2,2'-bipy)2]2+, in which the 1-D chains are extended into a 3-D framework through C-H ··· π and π-π stacking interactions. Compound 2 is a discrete structure consisting of [α-P2W18O62]6- and two [Co(H2biim)3)]2+ cations, forming a 3-D supramolecular framework via N-H ··· O hydrogen bonds and C-H ··· π interactions. Photoluminescence properties of 1 and 2 have been investigated at room temperature. [ABSTRACT FROM AUTHOR]
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