DIISOCYANIDE LIGANDS

See entry diisocyanide ligands See related cyano compounds... 

Metal cyanides are readily oxidised and those of some heavy metals show thermal instability. The covalent cyano group is endothermic, and hydrogen cyanide and many organic nitriles are unusually reactive under appropriate circumstances, and A-cyano derivatives are reactive or unstable. The class includes the groups 3-CYANOTRIAZENES, METAL CYANIDES (AND CYANO COMPLEXES) DIISOCYANIDE LIGANDS... 

It is preferable to prepare and use various diisocyanide ligands (trimethylene to octamethylenene diisocyanides, 1,4-dimethylenecyclohexane and 1,3-xylylidene diisocyanides) as solvent solutions rather than as isolated materials, because violent explosions have been observed dining vacuum distillation of these ligands [1]. Four such ligands were, however, distilled uneventfully [2]. Individually indexed compounds are ... 

CYANOTRIAZENES, METAL CYANIDES (AND CYANO COMPLEXES) DIISOCYANIDE LIGANDS... 

See entry DIISOCYANIDE LIGANDS See related CYANO COMPOUNDS... 

In this section, we describe the construction of metal-containing polymers and supramolecular assemblies, in which metallic centers are linked by a bridging diisocyanide ligand along with their photophysical properties (Fig. 3). 

Palladium(II)- and platinum(II)-containing polymers assembled by diisocyanide ligands are generally not luminescent.37 Because photoinduced labili-zation of the ligand in M C=N—R systems is possible, absence of luminescence can occur when this photochemical process happens, and consequently the light energy is wasted. As a result, luminescence is often not observed at room temperature in solution for such coordination polymers. Occasionally, only weak emissions at low temperature in the solid state can be detected. 

---