Xiao-Ping Zhou, Zhengtao Xu,* Matthias Zeller, Allen D. Hunter, Stephen Sin-Yin Chui, and Chi-Ming Che.

Abstract: The bifunctional molecule tetrakis(methylthio)-1,4-benzenedicarboxylic acid (TMBD) interacts with the increasingly harder metal ions of CuI, CdII, and ZnII to form the coordination networks of Cu₂TMBD, CdTMBD, and Zn₄O(H2O)₃(TMBD)₃, where the carboxyl group consistently bonds to metal ions, while the softer methylthio group binds with preference to the softer metal ions (i.e., chelation to Cu⁺, single-fold coordination to Cd²⁺, and nonbonding to Zn²⁺). Diffuse-reflectance spectra show that the metal-thioether interaction is associated with smaller electronic band gaps of the solidstate networks.

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