School of Chemistry, Suranaree University of Technology^* Department of Chemistry HKUST Hong Kong^**
○Samroeng Krachodnok^* Kittipong Chainok^* Kenneth J. Haller^* Herman H-Y. Sung^** Fanny L-Y. Shek^** Ian D. Williams^**

Exploration of the structural chemistry of organically modified zinc vanadates has been carried out through hydrothermal crystallization reactions of various organic bases with zinc acetate and vanadium pentoxide (V₂O₅) under different conditions of pH, stoichiometry, temperature, time and concentration. A wide variety of product types have been found in which either organic or complex cations crystallize with anionic vanadate chains for example [ZnIm₄][VO₃]₂, or vanadate clusters as in 2[Zn(2-MeIm)₄]2[2MeIm-H][V₁₀O₂₈]. Alternatively the organo-zinc and vanadate components may be connected as in the network solids [Zn(en)(VO₃)₂], or [Zn(Im)(Im)^-VO₃] containing [Im]^- anions (shown in Fig). Finally even discrete molecular species such as [{Zn(2-MeIm)₃}₂V₄O₁₂] which is composed of a cyclotetravanadate ring with two pendant zinc tris-imidazolyl groups can be isolated in phase pure form. The Thai Research Fund (2002 RJG PhD scholarship to S.K.) and RGC (HK) are thanked for financial support of this work.