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A series of polyoxotungstates based on monovacant Keggin-type anions have been synthesized via a step-by-step assembly process. Reaction of trivacant Keggin-type polyoxotungstate precursors with cupric sulfate at pH ≈ 5 in the presence of 1,2-ethylenediamine (abbreviated as en) led to the isolation of a inorganic–organic hybrid compound, [Cu(en) 2 ][Cu(en) 2 H 2 O] 2 ...
The second-order nonlinear optical (NLO) properties of Keggin-type organosilicone derivatives [PW11O39(RSi)2O]3− are investigated by time-dependent density functional theory (TDDFT). Our results indicated that the length of conjugated chain R has a crucial effect on the charge transfer (CT). The direction of CT alters with the end-cap-substituted electron donating or accepting moieties (NH2 or NO2...
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