Jie Dai

A novel oxo-bridged dinuclear vanadium(V,V) complex of schiff base and its conversion with mononuclear vanadium(IV) complex

Abstract Two vanadium complexes of the Schiff base ligand, o-N-salicylidene amino-methylphenol (abbreviated as Salamp), have been synthesized and characterized. One is a vanadium(IV) complex, VO(HSalamp)2 (1) and the other is an oxo-bridged dinuclear vanadium(V,V) complex, [VO(Salamp)]2O (2). The crystal structure of 2 has been determined by single-crystal X-ray diffraction techniques. The V—O—V angle is 117.3°, giving a novel non-linear structure. It would be the first example of this type of complex with the V—O—V angle near to 120°. Under aerobic conditions, complex 1 reacts with VO(acac)2 to yield the dimer 2.

Direct solvothermal growth, crystal structures, and optical properties of one-dimensional lanthanide selenidoarsenate(V) polymers [Ln(dien)2(µ3-AsSe4)] (Ln = Nd, Sm): the first example of an AsSe43− anion acting as a ligand to a lanthanide complex

Two novel lanthanide selenidoarsenates(v) [Ln(dien)2(micro(3)-AsSe(4))] (Ln = Nd 1, Sm 2, dien = diethylenetriamine) were synthesized by the reactions of As(2)O(3) and Se with Nd(2)O(3) or Sm(2)O(3) in dien under solvothermal conditions. 1 and 2 are in the orthorhombic crystal system with Iba2 and Pbca space groups, respectively. The [AsSe(4)](3-) anion acts as a tridentate micro(3)-AsSe(4) ligand to bridge the lanthanide [Ln(dien)2](3+) complexes leading to one-dimensional neutral [Ln(dien)(2)(micro(3)-AsSe(4))](infinity) chains. The chains contact through hydrogen bonding to form network structures. The lanthanide center lies within a nine-coordinated environment involving six N atoms of two dien ligands and three Se atoms of two different tetrahedral [AsSe(4)](3-) anions forming a distorted monocapped square antiprism. The novel coordination polymers [Nd(dien)2(micro(3)-AsSe(4))](infinity) and [Sm(dien)2(micro(3)-AsSe(4))](infinity) are the first examples of solvothermally synthesized selenidoarsenates with [AsSe(4)](3-) anion acting as a ligand in lanthanide complexes. The band gaps of 2.11 eV for 1, and 2.18 eV for 2 have been derived from optical absorption spectra. TG-DSC curves show that two compounds remove coordinated dien ligands in a single step.

Indium-sulfur supertetrahedral polymers integrated with [M(phen)3]2+ cations (M = Ni and Fe).

A series of supertetrahedral polymers of chalcogenometalates (T3 cluster compounds) integrated with M-phen complexes (phen =1,10-phenanthroline; M = Ni, Fe) was prepared by a similar solvothermal technique. Compound [Fe(phen)(3)](4)[H(4)In(20)S(38)]·Hphen·3HDMA·8H(2)O (Mp-InS-4) (DMA = dimethylamine) is a 1-D straight chain. Compounds [M(phen)(3)](4)[In(20)S(37)]·6Hphen·4H(2)O (M = Ni, Mp-InS-5; Fe, Mp-InS-6) are the first reported 2-D Tn polymers integrated with complex cations of [M(phen)(3)](2+). Compound [Ni(phen)(3)](4)[H(4)In(20)S(38)]·2Hphen·2HDMA·3H(2)O (Mp-InS-7) shows a zigzag 1-D structure. We find that the reaction time is an important factor in assembling of the T3 clusters. Prolonging the reaction time seems favorable to the higher condensed phases (from 0-D to 2-D). However, a longer reaction time resulted in the crack of 2-D structure. Integrating M-phen complex cations with the chalcogenido anions can improve absorption of the materials in the visible range due to the charge transfers within the cations or between cations and anions.

Solvothermal preparation of inorganic–organic hybrid compound of [(ZnS)2(en)]∞ and its application in photocatalytic degradation

As a new polymer compound, [(ZnS)2(en)]∞ has been synthesized by solvothermal method from elemental sulfur and zinc(II) salt in ethylenediamine. Detailed characterizations of the new coordination polymer have been discussed. The compound reveals a comparative good photocatalytic activity for degradation of dyestuff X-2R.

Transition Metal Complexes as Linkages for Assembly of Supertetrahedral T4 Clusters

Tn clusters are usually connected into frameworks by sulfur bridges. A new type of T4 compounds in which the clusters are linked by both sulfur bridges and transition metal complexes are described.

Mercury(II) complexes of 4,5-ethylenedithio-1,3-dithiole-2-thione, having S…S and S…Cl contract assembled ribbon structure

Abstract Two mercury(II) complexes of 4,5-ethylenedithio-3,3-dithiole-2-thione (C5H4S5), [Hg2(C5H4S5)2Cl4] (1) and [Hg2(C5H4S5)2Br4] (2), were synthesized and the structure of complex 1 was characterized crystallographically. Complex 1 has a dimeric structure, in which each mercury atom takes a tetrahedral geometry and is coordinated by two bridging chloride, one terminal chloride and one thiocarbonyl sulfur atom (Cue5f8S) of the ligand. These dimers are further packed to form a one dimensional ribbon structure via intermolecular S…S and S…Cl contacts. All of the ligands in the ribbon are co-planar and weakly conjugated.

Electrochemistry of vanadium complexes of o-N-salicylideneaminoethylphenol. A well characterized cyclic mechanism for the gain or loss of vanadyl oxygen

Abstract The electrochemistry of two vanadium complexes of o -N-salicylideneaminoethylphenol, VO(HSalamp) 2 ( 1 ) and [VO(Salamp)] 2 O ( 2 ), is reported. The oxidation of 1 , V(V)/V(IV), is completely reversible. The electrochemical properties of V(IV)/V(III) of 1 are complex and the results support a well characterized cyclic scheme mechanism. The redox reactions are accompanied by the conversions between five-coordinate oxovanadium(IV) complex and six-coordinate vanadium(III) complex by losing or gaining vanadyl oxygen. Oxidation-state-dependent change in coordination environment was also seen in the electrochemical behaviour of the complex 2 .

A Wheel-Shaped Indium–Telluride Nanocluster [In18Te30(dach)6]6–: Its Formation and Structure

The preparation and crystal structure of a large wheel-shaped indium-telluride compound are reported. The inorganic cluster is decorated with 1,2-diaminocyclohexane molecules that play an important role in the formation of the nanoring. A related new 1D polymeric InTe compound is also presented in order to understand the effect of acidity on the formation of the ring structure.

Cationic Main-Group Metal Chalcogenide with a 1-D Polymeric Structure, [{In(dien)}2(InTe4)]·Cl

Coordination of unsaturated [In(amine)] (3+) onto indium telluride structure, where the complex ion has higher positive charge, not only forms an organic-inorganic hybrid polymeric structure, but also offers an indium telluride with positive charge. Based on this strategy, cationic networks of metal chalcogenide may be expected.

A lanthanide–titanium (LnTi11) oxo-cluster, a potential molecule based fluorescent labelling agent and photocatalyst

Although a lot of titanium oxo-clusters (TOCs) have been synthesized and characterized, research studies on their application properties are still limited. The work described here is not only aimed at the synthesis and crystal structures of the TOCs, but also aimed at exploration of their potential applications in molecule based fluorescence labelling and photocatalysis. Three heterometallic TOC compounds with lanthanide (Ln) elements Sm(iii) (1), Eu(iii) (2) and Gd(iii) (3) are prepared and their cluster structures are characterized as LnTi11 cages. Compound 2 exhibits the characteristic fluorescence of Eu(iii) and the emission intensity can be decreased upon irradiation and recovered by air oxidation, which is attributed to the energy transfer between Eu(iii) and photo-induced Ti(iii) of the oxo-TiO cluster. The fluorescence intensity of 2 can be significantly increased when treated with 1,10-phenanthroline. The catalytic properties of 2 were determined by the degradation of dyes on a paper substrate. Compound 2 has potential applications as a molecule based fluorescent labelling agent and photodegeneration catalyst.