There is a preliminary account of an authentic discrete C4, structure for the Sn94-metal cluster In [Na(2,2,2-crypt)+]4Sn94_: J. D. Corbett and P. A. Edwards, J. Chem. Soc., Chem. Commun., 984 (1975). The dihedral angles between planes perpendicular to the fourfold axis are about 3°( J. D. Corbett, private communication). Electronic features, orbital energy separations, and possible degeneracies may dictate whether a £>3h or C4v type of polyhedron is adopted In clusters. (22) In triangular polyhedral faces for cluster complexes, the observed and theoretically expected situations are (a) equilateral triangular faces where vertex atoms have the same connexity, (b) isosceles triangular face with AA edge longer where vertex A has a higher connexity than vertex B, (c) an isosceles triangular face with AA edge shorter where vertex A has a lower connexity than vertex B, and (d) vertex positions of highest connexity are closer to the polyhedral center than vertex positions of lower connexity. Synthesis and Chemical Characterization of PlatinumCarbonyl Dianions [Pt3(CO)6]"2-( = MO, 6, 5, 4, 3, 2, 1).

small difference between the solvolysis rates of system 2 and the corresponding fluorenylidene derivatives78 argues against high contribution of this effect.

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