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Crystallographic disorder between structurally inequivalent groups has been investigated by X-ray diffraction studies. By use of a technique in which a crystal is doped with an impurity, the disorder at a single site was varied in a controlled fashion. Specifically, single crystals of composition {η 3 -HB(3-Bu t pz) 3 }Zn(CN) x X 1-x (3-Bu t pz=3-C 3 N 2 H 2 Bu t ; X=Cl, Br, I; 0≤x≤1) were obtained by cocrystallization of {η 3 -HB(3-Bu t pz) 2 }ZnCN

The molecular structures of a series of complexes cis-mer-MoOCl 2 (PR 3 ) 3 (PR 3 =PMe 3 , PMe 2 Ph) have been investigated by X-ray diffraction methods. The data indicate a large range of apparent Mo=Obond lengths. The apparent lengthening of the Mo=O bond in these complexes is rationalized in terms of compositional disorder with the isostructural trichloride derivative mer-MoCl 3 (PR 3 ) 3

Syntheses and physical properties of pterin and pteridine complexes for first-row transition metals are described. Characterization used single-crystal x-ray diffraction, spectroscopic, and microanalytical methods. These data all indicate that pterin and pteridine ligands chelate via oxygen and nitrogen atoms. Three copper complexes have been structurally determined. Cu(tppb)(pterin) [tppb − =tris(3-phenylpyrazolyl)hydroborate] crystallizes in the triclinic space group P1