assistance.Registry No. [Co(bpy)2(PN-H)](C104)2, 100229-36-5; [Cu(bpy)-(PN)C1](C104).H20, 100229-39-8. Supplementary Material Available: Listings of thermal parameters, positional parameters of the hydrogen atoms, selected torsion angles and asymmetry parameters, least-squares planes, bond lengths and angles in bpy moieties, and observed and calculated structure factors and packing diagrams (Figures 3 and 4) (48 pages). Ordering information is given on any current masthead page.
Note Added in Proof. Professor Strausz has kindly informed us that, subsequent to the appearance of his recent paper,6 he found strong evidence against the ketocarbene assignment for the carbonyl-containing species observed by IR. In particular, matrix photolysis of perfluoro-4-diazo-3-pentanone gave concentrations of the derived ketocarbene which were too low to detect by ESR, yet IR revealed a carbonyl-bearing species analogous to that from 1. The Strausz group has made an additional interesting observation, viz. that vapor-phase photolysis of 1 in the presence of perfluoro-2-butyne at X I 320 nm yields a ketocarbene trapping product, perfluorotetramethylfuran.Registry No.
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