Homoleptic anionic complexe

An additional aspect of the literature since 1980 has been an increasing interest in the characterization of charged amido complexes. In 1980 none had been strucmrally characterized. Several anionic complexes, including, for example, the homoleptic species [Na(thf)2Ti N(C6F5)2 4l [Na(thf)6]2[Zr(Ti -NC4H4)6], [ U(thf) 2Zr(NMe2)6] [ Li... 

Cyanide complexes of molybdenum(II) generally appear elsewhere under other classifications, where CN- is an andlliary ligand. The homoleptic anions [Mo(CN)6]4- and [Mo(CN)7]5- (pentagonal bipyramid) have been reviewed elsewhere.10... 

Homoleptic platinum carbonyl anions, characteristics, 8, 410 Homoleptic tantalum complexes, preparation and characteristics, 5, 108... 

Complex metal hydride solid-state compound containing homoleptic, anionic metal-hydrogen complexes d, d, d etc electron configuration of transition element h.H enthalpy of hydride formation as determined from pressure-composition isotherms during desorption by using van t Hoff s method... 

Routes to homoleptic isocyanide complexes have been defined in thf (Scheme 46). Ta L6 (L = xylyl isocyanide) was reduced by ACg (A = K, Cs) to [Ta 1L6]. This anion appears to be octahedral. Its 13C NMR resonance occured at 210 ppm, the most downfield shift observed for a diamagnetic homoleptic isocyanide complex. Reaction with the NO source N-methyl-N-nitroso-/ -to 1 uenes u 1 lbnam ide provided Ta I(NO)L5 whose essentially linear NbNO fragment is consistent with the formal presence of ligand NO+. Direct nitrosylation of [M (CO)6] with 2 eq [NO][PF6] in the presence of L in CH2C12 at — 60 °C provided r/,v-[M (NO)2L4]1,662 The reaction represents a rare example of non-oxidative displacement of all CO ligands from a homoleptic carbonylme-talate. 

Homoleptic anionic zirconium and hafnium phosphine complexes have recently been prepared using bisphosphinine ligands, which are phosphine analogs of the ubiquitous bipyridyl ligand. Structure determinations of the Li3(solv)Cl salts were performed (solv = DME for M = Zr and THF for M = Hf) show the overall geometry around the metal center to be trigonal prismatic. Disruption of the aromaticity is... 

Finally some homoleptic alkyne complexes of scandium and some rare earths are known. Tris(phenylethynyl) scandium is formed as a dark brown product after treatment of phenylethyne with butyl lithium at — 78°C in hexane, followed by the addition of scandium trichloride at room temperature. The compound is inflammable in air (Hart and Saran, 1968 Hart et al., 1970). The reaction of the anionic... 

The erbium compound decomposes upon heating in hexane with formation of a pink solution, which contains the lithium salt of the homoleptic anion [Er CH(SiMe3)2 4] . This complex could not be prepared independently via chlo-ride-silyl exchange from [Li(THF)4][Er CH(SiMe3)2 3C1] and excess LiCH(SiMe3)2. 

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