Chalcogen carbene complexes

A number of push-pull Fischer-type carbene complexes 84 have been prepared and exhibit interesting nonlinear optical properties <2005JOM4982> (see Equations 10 and 34). The influence of changing the chalcogen atom and the effect of varying the chain length on these optical properties have also been investigated. 

Carbene Complexes with Chalcogen Halides and Oxides... 

The first examples of a chalcogen insertion into a transition metal-carbene bond were reported in 1981. Stirring solutions of the pentacarbonyl-(diarylcarbene)tungsten complexes 39 in pentane in the presence of solid sulfur afforded the thioketone complexes 40 [Eq. (8)].171 The reaction rate increased considerably when pentane was replaced by CS2 as the solvent due to the higher solubility of elemental sulfur in CS2. 

Scheme 8.20 Preparation of the five-coordinate osmium carbynes 75a,b and their reactions with chalcogens, HCI and chlorine to afford the six-coordinate carbene osmium(II) complexes 76a,b, 77a,b, and 78a,b (a R = Me, b R = Ph E = S, Se, Te)...

X-ray crystallography amino(l-alkynyl) carbenes, 170 chalcogen-bridged metal-carbonyl complexes, 244-248, 250-253, 255-256, 258-264, 266-272, 274-279, 281, 283-284, 287, 289, 292-293, 295-310 cobalt-alkyne complexes, 76-77, 82-83, 89-90, 94-96... 

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