DIORGANOTIN COMPLEXES OF [[beta]]-DIKETONATE LIGANDS. E. Mundorff¹, F. Caruso², A. Cingolani³, F. Marchetti³, C. Pettinari³, M. Rossi^l. ¹Department of Chemistry, Vassar College, Poughkeepsie, NY 12601, ²Istituto di Strutturistica Chimica, CNR, 00016, Monterotondo Stazione (Rome), Italy, ³Dipartimento di Chimica, Universita' di Camerino, Camerino, Italy.

From our studies on potential diorganotin antitumor compounds, we present the molecular structures of two complexes: 1 trans - dicyclohexyl-bis(1,3-dimethyl-4-acetyl-pyrazolon-5-ato)tin(IV) [monoclinic, C2/c, a = 34.398(10)Å, b = 18.242(7)Å, c = 9.248(3)Å, [[beta]] = 97.81(3)deg.] and 2 trans - dibenzyl-bis[1-phenyl-3-methyl-4-methoxyformyl-pyrazolon-5-ato)tin(IV), [monoclinic, P2₁/n, a = 17.329(4)Å, b = 10.555(3)Å, c = 19.174(4)Å, ,[[club]] = 91.07(2)deg.. A view of compound 1 is shown.

Both compounds show the metal six-coordinate in a distorted octahedral arrangement known as skewed trapezoidal bipyramidal (STB). A strong deformation of the trans diorganotin angle, C-Sn-C, is observed (154.6(5)deg. for 1 and 164.5(4)deg. for 2). The factors influencing the structures of these compounds and other related species will be dicussed.