Bridged Dichromium Complexes

Bridged Dichromium Complexes.— The thermodynamics and kinetics of the equilibria between di-/U-hydroxo and -hydroxo dinuclear complex ions of the type [(en)aCr-//-(OH)a-Cr(en)a + and [(H20)(en)2Cr-i -(0H>Cr(en)2(0H2) + have been investigated. In acid solution (31) is rapidly converted into a mixture... 

Bridged Dichromium Complexes.— Aquation of the hydroxo-bridged complex... 

Dichromium(II) complexes with zwitterionic glycine bridges can be crystallized168 from aqueous solutions (equation 18). 

Inelastic neutron scattering experiments have been used to study the ground state splitting of singly bridged dichromium(III) complexes of... 

The dichromium-/x-naphthalene compound (III) of Lagowski et al. (17) is a slipped triple-decker sandwich, in which the metals share two -electrons of the bridging carbon atoms (C9,10 of naphthalene) and thus complete their 18e shell. In the dinuclear CrRu- -naphthalene complex... 

Dichromium and dimolyhdenum quintuply bonded compounds undergo reactions with alkenes and alkynes [107], resulting in the formation of cydoaddition products that have a reduced formal M-M bond order and a hydrocarbon bridge. The dichromium diazediene complex 5 forms the expected [2-1-2] cydoaddition product upon reaction with electron-rich alkynes electron poor alkynes add across the metal-hgand bond instead [108]. This difference in reactivity is believed to be a reflection of the unique ligand-based HOMO of 5. 

Bridged Chromium Complexes.—The mixed Cr -Co -dimer ion [(en)aCr(OH)a-Co(en)j] + behaves like a bridged dichromium(iii) complex and is totally unlike the analogous dicobalt(iii) species. The first bridge hydrolysis was examined (Scheme 9). 

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