All-Inorganic Networks and Tetramer Based on Tin(II)-Containing Polyoxometalates: Tuning Structural and Spectral Properties with Lone-Pairs
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https://figshare.com/articles/dataset/All_Inorganic_Networks_and_Tetramer_Based_on_Tin_II_Containing_Polyoxometalates_Tuning_Structural_and_Spectral_Properties_with_Lone_Pairs/2260822
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资源简介：
Two MOF-like but all-inorganic polyoxometalate-based
networks,
[Na7X2W18Sn9Cl5O68·(H2O)m]n (1, X = Si, m = 35; 2, X = Ge, m = 41), and the
molecular tetramer Na6[{Na(μ-OH2)(OH2)2}6{Sn6(B-SbW9O33)2}2]·50H2O (3) have been prepared and characterized by
X-ray diffraction and spectroscopic methods. All three compounds exhibit
unique structural features, and networks 1 and 2 incorporate the highest nuclearity of Sn(II)-containing
POMs to date. Tetramer 3 comprises bridging Sn(II) ions
with [B-SbW9O33]9– units and exhibits two highly unusual features, a long-range Sb···Sb
interaction and an intramolecular charge-transfer transition involving
donation of the lone-pair electron density on both Sb(III) and Sn(II)
to the POM. The electronic structure and excited-state dynamics have
been studied by transient spectroscopy, spectroelectrochemistry, DFT
calculations, and resonance Raman spectroscopy. The synergistic effect
of two types of stereoactive lone-pairs on Sb(III) and Sn(II) is critical
for the charge-transfer absorption feature in the visible.
创建时间：
2014-08-27
