title: Syntheses, crystal structures, and properties of five new transition metal molybdenum(VI) selenites and tellurites.
abstract: Five new transition metal molybdenum(VI) selenites or tellurites, namely, TM(MoO(3))(SeO(3))(H(2)O) (TM = Mn, Co), Fe(2)(Mo(2)O(7))(SeO(3))(2)(H(2)O), Cu(2)(MoO(4))(SeO(3)), and Ni(3)(MoO(4))(TeO(3))(2), have been prepared and structurally characterized. They belong to five different types of structures. Mn(MoO(3))(SeO(3))(H(2)O) and Ni(3)(MoO(4))(TeO(3))(2) are non-centrosymmetric and crystallize in the orthorhombic space groups Pmc2(1) and P2(1)2(1)2(1), respectively, whereas Co(MoO(3))(SeO(3))(H(2)O), Fe(2)(Mo(2)O(7))(SeO(3))(2)(H(2)O), and Cu(2)(MoO(4))(SeO(3)) are centrosymmetric and crystallize in P1, C2/c, P2(1)/c, respectively. The Mo(6+) cations in Mn(MoO(3))(SeO(3))(H(2)O), Co(MoO(3))(SeO(3))(H(2)O), and Fe(2)(Mo(2)O(7))(SeO(3))(2)(H(2)O) are in severely distorted octahedral geometry whereas those in Cu(2)(MoO(4))(SeO(3)) and Ni(3)(MoO(4))(TeO(3))(2) are in a slightly distorted tetrahedral geometry. Second-Harmonic Generation (SHG) measurements revealed that (MoO(3))(SeO(3))(H(2)O) displays a moderate SHG signal of about 3 x KH(2)PO(4) (KDP) whereas the SHG response of Ni(3)(MoO(4))(TeO(3))(2) is much weaker than that of KDP.
authors.affiliation: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, PR China.
authors.forename: Su-Yun
authors.initials: SY
authors.lastname: Zhang
authors.forename: Hai-Long
authors.initials: HL
authors.lastname: Jiang
authors.forename: Chuan-Fu
authors.initials: CF
authors.lastname: Sun
authors.forename: Jiang-Gao
authors.initials: JG
authors.lastname: Mao