Electronic structure cyclopentadienyl

Let us now explain how the formal MI X and bonding assignments are obtained, using Cp2Nb(CO)Cl as an example. A niobium atom has five valence electrons. A cyclopentadienyl (Cp) ligand has formal Lewis structure... 

Alike metallocomplex anion-radicals, cation-radicals of odd-electron structure exhibit enforced reactivity. Thus, the 17-electron cyclopentadienyl dicarbonyl cobalt cation-radical [CoCp(CO)2] undergoes an unusual organometallic chemical reaction with the neutral parent complex. The reaction leads to [Co2Cp2(CO)4]. This dimeric cation-radical contains a metal-metal bond unsupported by bridging ligands. The Co—Co bond happens to be robust and persists in all further transformations of the binuclear cation-radical (Nafady et al. 2006). 

The electronic structure of bis-cyclopentadienyl compounds is discussed in terms of molecular orbital theory. The way in which symmetry arguments may be used to facilitate such an analysis is described in some detail. 

An intriguing iso-osmabenzene with an allenic (1,2,4-cyclohexatrienic) structure was reported its X-ray crystallographic determination confirmed the presence of an -hybridized carbon atom in the ring [298], Martin and coworkers surveyed the criteria for judging the aromaticity of various metallabenzenes (resonance energy, molecular structure, electronic structure, magnetic resonance, chemical reactivity), concluding that whereas aromaticity is undoubtedly present, metallabenzenes show specific reactions such as the formation of a cyclopentadienyl semisandwich metal complex [299],... 

The pyrrole anion, C4H4N -, is a 6 n electron species that has the same electronic structure as the cyclopentadienyl anion. Both of these anions possess the aromatic stability of 6 n electron systems. 

Gulino, A., Casarin, M., Conticellio, V.P. etal. (1988) Efficient synthesis, redox characteristics, and electronic structure of a tetravalent tris(cyclopentadienyl)cerium alkoxide complex. Organometallics, 1, 2360. 

Synthesis and structural chemistry of non-cyclopentadienyl organolanthanide complexes have been reviewed by Edelmann and Schumann et /.13,13a 24 Marques et al. have published a review on the chemistry of the lanthanide using pyrazolylborate ligands.36 Theoretical investigations on lanthanide alkyls have been published by Eisenstein et al. under the title Lanthanide complexes electronic structure and H—H, C-H, and Si-H bond activation from a DFT perspective. ... 

Orgel LE (1956) Electronic structures of some mixed compounds of cyclopentadienyl and carbon monoxide or nitric oxide with the transition metals. J Inorg Nucl Chem 2 315-322... 

Orgel LE (1955) Electronic structure of metal bis-cyclopentadienyls. J Chem Phys 23 954-958... 

Moffitt W (1954) The electronic structure of bis-cyclopentadienyl compounds. J Am Chem Soc 76 3386-3392... 

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