Ying-Hua Sun

Hydrothermal synthesis and characterization of (enH2)3.5[As8V14O42(PO4)]·2H2O

Abstract The compound (enH2)3.5[As8V14O42(PO4)]·2H2O 1 (en=ethylenediamine) has been synthesized and characterized by means of elemental analysis, IR spectrum, ESR spectrum, XPS spectrum, TG analysis and single crystal X-ray diffraction analysis. The compound 1 crystallizes in monoclinic system, space group C2/c, a=44.280(9) A , b=11.963(2) A , c=20.939(4) A , β=105.59(3), V=10683(4) A 3 , Z=8 and R1(wR2)=0.0398(0.0885). The compound 1 is constructed from [As8V14O42(PO4)]7− anions and H2en cations linked through hydrogen bonds into a network. The [As8V14O42(PO4)]7− cluster consists of 14 VO5 square pyramids linked by 4 As2O5 handle-like units, and includes at its center an ordered PO43− anion.

A new mixed molybdenum–vanadium polyoxometalate double-supporting transition metal complex: {[Co(phen)2]2-C2O4} {H2P O44[Co(phen)2(H2O)]2}·7H2O

The new polyoxometalate double-supporting transition metal complexes, {[Co(phen)2]2C2O4} {H2P O44[Co(phen)2H2O]2}·7H2O (1) (phen = 1,10-phenanthroline) have been hydrothermally synthesized and characterized by single crystal X-ray analysis, IR, XPS, ESR and elemental analysis. Compound 1 is composed of a highly reduced tetra-capped pseudo-Keggin polyoxoanion supporting two transition metal complexes, a binuclear cobalt complex cation and lattice water. The magnetism and third-order non-linear optical properties of 1 have also been studied.

Synthesis, crystal structure and non-linear optical properties of a new cyanide-containing compound

Reaction of K3[Fe(CN)6], NiCl2 and diethylenetriamine (dien) resulted in the formation of a cyanide-containing heterometallic compound [Ni(dien)2]2[Fe(CN)6]·4H2O 1. The structure consists of two octahedral [Ni(dien)2]2+ cations, one octahedral [Fe(CN)6]4− anion and four crystallization water molecules, which are held together by hydrogen-bonding interactions. Its TG curve exhibits two stages of mass loss. Compound 1 in DMF solutions has a very strong third-order non-linear optical (NLO) behavior with an absorption coefficient and refractive index α2 = 1.10 × 10−11 m w−1, n 2 = −3.05 × 10−19 m2 w−1, respectively, and third-order NLO susceptibility χ(3) 4.34 × 10−13 esu.