Journal
JOURNAL OF COORDINATION CHEMISTRY
Volume 63, Issue 19, Pages 3373-3383Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00958972.2010.511665
Keywords
Polyoxovanadates; Vanadosilicate; Vanadogermanate; Antiferromagnetic interaction
Categories
Funding
- Natural Science Fund Council of China (NFSC) [20731002, 10876002, 20801004, 20701011, 20801005]
- Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP) [200800070015]
- State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology [ZDKT08-01]
- Science Foundation of Beijing Municipal Science and Technology Commission [Z09010300820902]
- Science Foundation of Beijing Municipal Commission of Education [20091739006]
- Science Foundation of Hebei Normal University [L2005Q08]
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Two [V15M6(OH)6O42(Cl)]7- (M = Si for 1, Ge for 2) cluster anions with protonated amines as counterions have been synthesized under hydrothermal conditions and characterized by FT-IR, energy dispersive spectroscopy, XPS, powder X-ray diffraction, thermogravimetric analysis (TGA), elemental analysis, and single-crystal X-ray analyses. Both compounds consist of {V15M6O42(OH)6(Cl)} (M = Si for 1, Ge for 2), which are derived from {V18O42} by substitution of three {VO5} square pyramids with three {Si2O5(OH)2/Ge2O5(OH)2} units. It represents the first example of cage-like polyoxovanadates (POVs) containing three (Si/Ge)2O5(OH)2 units. There are extensive hydrogen bonding interactions between POVs and organoamines in 1 and 2. Compound 1 presents a close-packed layer aggregate, while 2 exhibits the packing of six-membered rings with a 1-D channel. Magnetism measurements demonstrate the presence of strong antiferromagnetic interaction between VIV centers in 1.
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