Homoleptic complexes cobalt

Fig. 12. Plot of number of amine protons versus log of the self-exchange rate constant (M s ) for cobalt hexaamine complexes at 25°C. No correction has been made for ionic strength differences. The data include some nonhomoleptic complexes. (1) [CoCNHslg], (2) [Co(en)3]3+ 2+, (3) [Co(chxn) ] + 2+ (4) [Co(tmen) ]3+ 2+, (5) [Co(dien)"]"+ 2+, (6) [Co(pet) P+ 2+, (7) [Co(linpen)P" 2 + (g) lCo(medien)(9) [Co(tacn)(dien)]3+ 2+, (10) [Co(tacn) (pet) (11) [Co(tacn) (etdien) (12) [Co(tacn) (budien) p+ 2+ 3 [Co(tacn)(medien)P, (14) [Co(diAmsar)] , (15) [Co(taptacn)P, (16) [Co(metacn) ] 2+, (17) [Co(diAmsar)P 2+, (18) [Co(sar)(19) [Co(sep)P 2, (20) [Co(dtne)] , (21) [Co(Amsartacn)], (22) [Co(Amsartacn)] , (23) [Co-(diAmchxnsar)] , (24) [Co(diAmchxnsar)] . The data for homoleptic complexes are taken from Table IV the other data are from reference U02). The line was calculated without the data for the sep and sar derivative cages and the [Coftmenls] couple.

Huo et al. studied the structure and energies of cobalt-carbonyl radicals as well as the cationic and anionic homoleptic mononuclear cobalt-carbonlys and the cobalt-carbonyl hydrides.35 The B3LYP functional was applied with all-electron triple- quality basis. They found that most of these complexes prefer less symmetrical structures and minor structural deformations may result in large energetic differences. 

Hydrocarbonyl compounds, lanthanide complexes, 4, 4 ( -Hydrocarbyl)bis(zirconocene), preparation, 4, 906 Hydrocarbyl-bridged cyclopentadienyl-amido complexes, with Zr(IV), 4, 864 Hydrocarbyl complexes bis-Cp Ti hydrocarbyls reactions, 4, 551 structure and properties, 4, 551 synthesis, 4, 542 cobalt with rf-ligands, 7, 51 cobalt with rf-ligands, 7, 56 cobalt with ]4-ligands, 7, 59 cobalt with rf-ligands, 7, 71 heteroleptic types, 4, 192 homoleptic types, 4, 192 into magnetic metal nanoparticles via ligand stabilization, 12, 87 via polymer stabilization, 12, 87 into noble metal nanoparticles... 

K. H. Theobold, J. Silvestre, E. K. Byrne, and D. S. Richeson, Homoleptic Mesityl Complexes of Cobalt(II). Synthesis, Crystal Structure, and Theoretical Description of Bis(p-mesityl)dimesityldicobalt, Organometallics 8, 2001-2009 (1989). 

Peters and coworkers also reported the homoleptic [Tl(PhBP3)] structurally characterized,5 and an anomalous low-spin cobalt complex, [CoI(PhBP3)], which exhibits a distorted tetrahedral... 

The pursuit of simple homoleptic cobalt complexes has become a ubiquitous means of structurally characterising each novel derivative of the basic tetrakis-, hydrotris- or dihydrobis-(pyrazolyl)borate ligand motifs. Complexes of this type are inaccessible only for the most sterically demanding Tp ligands, in which case reports of the isolation of LCoX (X = halide, OR, SR...) complexes have instead proliferated. Examples of these are now known for essentially every... 

The functionalized PPy films deposited on an electrode surface showed the characteristic electrochemical response of both the redox centers and the conjugated polymer. In contrast, any contribution of the incorporated metal to electron conductivity was not observed. With the same strategy, other polyrotaxane-like networks have been electrosynthesized from an intertwined het-eroleptic cobalt complex (23) [320], The spectroscopic and electrochemical properties of this complex were reported to be veiy similar to those of the homoleptic series 22. 

The Cobalt Triad. - Treatment of the metal chlorides C0CI2 or RhCl2.3H20 with CNCH2CHROH (R=H or Me) yields the homoleptic carbene complexes [m cN(H) CH2CHRO g]Clg (M=Co,Rh).The mononuclear carbene complex [Co(Cp)(CO)(=CN(Me)CH2CH2NMe]3 has... 

W. W. Brennessel, V. G. Young, Jr., and J. E. Ellis of the University of Minnesota, Minneapolis, synthesized the homoleptic bis(l,2,3,4-T " -anthracene)cobal-tate(l-) salt by reducing CoBr2 with potassium anthracene in tetrahydrofuran at -55 to -65 °C. A dark red solution resulted, from which deep red, nearly black microcrystals of the bis(anthracene)cobaltate(l-) were obtained in 82-87% yields. Although the analogous naphthalene complex is highly reactive (e.g., it readily reacts with carbon monoxide at normal pressure and at -60 °C to yield [Co(CO)4] , all attempts to isolate this interesting species have failed so far. Reduction of cobaltocene by three equivalents of potassium naphta-lene yielded a similarly labile source of Co ". Isolation and characterization of the homoleptic Co isonitrile complexes by other authors also encountered difficulties. ... 

Osvath P, Sargeson AM (1993) Synthesis of a large cavity homoleptic thioether cage and its cobalt(III) complex. J Chem Soc Chem Commun 40-42... 

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