Hydrothermal Synthesis And Properties Of Several Novel Polyoxomolybdate Compounds

In this paper, five unprecedent polyoxomolybdate {[V(2,2-bipy)₂]₂(4,4-bipy)- [Te₂Mo₄O₁9]}(1);[FeII(1,10-phen)(H₂O)V₂O₆] (2) and[Zn(1,10-phen)(H₂O)V₂O₆] (3)(1,10-phen = 1,10-phenanthroline); Cu(phen)V₂Se₂O₁0 (4); (C₅H₆N)₄.5H₁.5(P₂W₁8- O₆2)·1.5H₂O(5) have been hydrothermally synthesized. Structures of the five complexes have been determined by single crystal X-ray diffraction. The compound (1) consists of one disubstituted Lindqvist-type polyoxoanion [Te2Mo4O19]6- supporting two organic vanadyl moieties [V(2,2-bipy)₂]³⁺ forming the neutral molecule {[V(2,2-bipy)₂]₂[Te₂Mo₄O₁9]} groups, which are joined together by offsetÏ€-Ï€stacking interactions between pyridine rings of 2,2-bipy along the b, c-plane to form a two-dimensional grid-like network. The compounds (2)and (3)are isostructural, whose general formula can be describes as [M(phen)(H₂O)V₂O₆] (M = Fe for (2), Zn for (3), and which consist of one cation unit [MII(phen)(H₂O)]²⁺ and one [V2O6]2- anion cluster fused together from two VO4 tetrahedra, the VO4 tetrahedra connect each other by corner-sharing O atoms to form a chain-like oxo-vanadium cluster along c axis, these one-dimensional chains bridged each other through the cation units [FeII(phen)(H₂O)]²⁺ or [Zn(phen)(H₂O)]²⁺ further forming a two-dimensional layer-like framework. The compound (4) consists of One-dimensional infinite chain, the adjacent chains are stably packed together via theÏ€-Ï€stacking interaction of the phen groups, forming Tne-dimensional supermolecular structure. The molecules of the compound (5) display an infinitely extended one-dimensional chain by the connectivity of protonated pyridine molecules and [P₂W₁8O₆2]6- for hydrogen bonds interaction.The crystal date of all compounds:1. {[V(2,2-bipy)_2]2(4,4-bipy)[Te₂Mo₄O₁9]} (1): triclinic system,,PÄ«(2) space group, a = 10.412(2)A, b = 11.158(2)A, c = 12.670(3)A,α= 75.08(3)°,β= 78.88(3)°,γ= 71.69(3)°, V = 1340.23A3, Z = 1, R₁ = 0.0453, wR₂ = 0.1150。 2. [FeII(1,10-phen)(H₂O)V₂O₆] (2)å’Œ[Zn(1,10-phen)(H₂O)V₂O₆] (3)(1,10-phen = 1,10-phenanthroline),(2):monoclinic system, P2(1)/c space group, a = 7.986 A, b = 21.4568 A, c = 9.5506 A,β= 112.5790(10)°, V =1498.34(19) A3;化合物(3): a = 7.8655 A, b = 21.1761 A, c = 9.4726 A,β=112.86(0)°,V = 1453.81(64) A3。3. Cu(phen)V2Se2O10 (4):triclinic system, PÄ«space group, a = 8.955(3)A, b = 10.922(4)A, c = 11.065(4)A,α= 65.452(3)o,β=71.810(4)o,γ= 74.054(4)o, V = 922.0(5) A3, and Z = 2。4. (C5H6N)4.5H1.5(P2W18O62)·1.5H2O(5) : monoclinic system, C2/m space group, a=26.970(3)A, b=13.9730(16)A, c=20.777(2)A,β=102.33(0)°, V=7.64927nm3, Z=4, R=0.0412。...