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Three novel vanadium selenites with the formulae [(VO2)(l, 10-phenanthro- line)(SeO3H)]2 1, [(VO2)(2, 2'-bipyridine)]2(SeO3) 2 and [(VO)(H2O) (SeO2)2]2(H2EDD) 3 (EDD = Nl, Nr-(ethane-l, 2-diyl)diethane-l, 2-diamine) were hydrothermally synthesized, and characterized with elemental analysis, FT-IR spectrum, Raman spectrum, TG-DTA analysis, EPR spectra, and single-crystal X-ray diffraction analysis. Compound 1 belongs to the triclinic system, space group P with a = 7.7527(5), b = 9.5345(10), c = 9.8192(8) Å, a = 92.712(3), β = 105.540(3), γ = 108.154(4), °657.66(1) Å3, Mr = 782.22, Z = 1, F(000) = 384, μ(MoKa) = 3.544 mm-1, R = 0.0432 and wR = 0.1142; Compound 2 is of orthorhombic system, space group P212 121 with a = 7.6574(15), b = 14.916(3), c = 19.085(4) Å, V= 2179.8(8) Å3, Mr = 605.21, Z = 4, F(000) = 1200, μ(MoKa) = 2.579 mm-1, R = 0.0338 and wR = 0.0658; Compound 3 belongs to the triclinic system, space group P1 with a = 9.247(2), b = 9.659(2), c = 7.2651(19) Å, a = 98.171(7), β = 103.709(5), γ = 114.712(13)°, V = 550.9(2) AÅ3, Mr = 828.03, Z = 1, F(000) = 400, μ(MoKa) = 7.537 mm-1, R = 0.0641 and wR = 0.2118. Compound 1 is constructed from alternating corner-shared [VO 4N2] octahedra and SeO3H units, forming a dimeric vanadium unit. These assemblies are further linked into an infinite chain via hydrogen bonds along the a axis. In the structure of 2, two distinct V centers form centrosymmetric [V2o6N4] clusters through edge-sharing, and the SeC<3 unit serves as a capping unit to fix the oxovanadate cluster. In the structure of 3, each [VO6] octahedron shares four oxygen atoms with adjacent Se atoms, while every SeC3 unit shares two oxygen atoms with neighboring V atoms. This connectivity of alternating VO6 and SeO3 units results in a joint-like chain. Based on the TGA analysis, these three compounds are thermally stable under 200° C.
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Jiegou Huaxue
ISSN: 0254-5861
CN: 35-1112/TQ
Year: 2009
Issue: 4
Volume: 28
Page: 445-452
0 . 5 4 4
JCR@2009
5 . 9 0 0
JCR@2023
ESI Discipline: CHEMISTRY;
JCR Journal Grade:4
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 0
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