The Preparation, Characterization, X-ray Structural Analysis, and Thermogravimetric Analysis of Tetrakis[1,3-Dimethyl-2(3H)-Imidazolethione]Zinc(II) Nitrate and Tetrafluoroborate


Chemistry and Biochemistry

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Two new compds., [Zn(dmit)

4][BF4]2 (1) and [Zn(dmit)4][NO3]2 (2), were synthesized and characterized via std. solid and soln. state methods including single crystal x-ray crystallog. (dmit = 1,3-dimethyl-2(3H)-imidazolethione). [Zn(dmit)4][BF4]2 crystallizes in space group Pbcn with a 11.954(2), b 21.260(4), c 12.749(3) Å, Z = 4. [Zn(dmit)4][NO3]2 crystallizes in space group I41/a with a = b 11.091(4), c 22.713(5) Å, Z = 4. Both structures display a compressed tetrahedral geometry in the zinc coordination sphere similar to previously reported iso-Pr and Bu analogs. The degree of distortion is closer to that noted for the recently reported Me iso-Pr analog than to the Me Bu complex. There are no significant differences between the nitrate and tetrafluoroborate coordination spheres, and the source of distortion appears to be close intramol. contacts. TGA results suggest that both complexes decomp. to yield ZnS2 instead of ZnS.