The Electronic Structures of Tetrahedral Cobalt(II) Complexes

Cotton, F. Albert; Goodgame, D. M. L.; Goodgame, M.

doi:10.1021/ja01484a002

Cited by 505 publications

(138 citation statements)

References 5 publications

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“…Thus, in the presence of a large excess of base (Co:Si: OH = 2.5:4:50), the Co(OH)2 initially present reacted further to produce, in part, deep blue solutions of [Co(OH)4] 2-, whose electronic spectrum [Umax = 535(sh), 590, 620 nm] was close to that published by Cotton et al (1961). A second product was deep blue Na2CoSiO4; no NaCo-smectite was formed.…”

Section: Clay Synthesis In the Presence Of Sodiumsupporting

confidence: 72%

Hydrothermal Synthesis and Characterization of Cobalt Clays

Bruce

1986

Clays and clay miner.

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Abstract--Reaction of mixtures of cobalt nitrate, colloidal silica, and a metal hydroxide (MOH) under hydrothermal conditions produced a range of cobalt hydroxysilicates, the components of which depended upon the identity of M, temperature, and reactant ratios. At 250~ ifM = Na, a smectite of composition Nao o6Coa.o7Si3.95Olo(OH)2 (I) was produced. IfM = K, either a mica, KCo2.sSi4Olo(OH)2 (II), intermediate between di-and trioctahedral, or a Si-deficient mica, KCo3Si3.7sOlo(OH)2 (III), was formed depending upon the reactant ratios. Similarly, if M = Cs, either a vermiculite or a 2:1 layer silicate intermediate between a mica and a brittle mica was produced. If M = Li, only the non-clay mineral Li2CoSiO4 was formed. Tetraalkylammonium hydroxides (NR4OH, R = methyl, ethyl, or propyl) yielded chrysotile. All phases were characterized by elemental analysis, transmission electron microscopy, and X-ray powder diffraction. Further characterization of smectite I was undertaken by diffuse reflectance, infrared, and Xray photoelectron spectroscopy. The layer charge in these clays appears to stem from cation vacancies within an almost trioctahedral sheet and, possibly, within the tetrahedral sheets. Some of the cobalt present had tetrahedral coordination geometry, but its location was not determined.

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Section: Clay Synthesis In the Presence Of Sodiumsupporting

confidence: 72%

Hydrothermal Synthesis and Characterization of Cobalt Clays

Bruce

1986

Clays and clay miner.

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“…The spectrum of the N,N'dimethylurea example is similar to those of (N-methylurea),]CI, to be isostructural with the oxygen bonded cobalt compound. Slight differences in the spectrum of a given complex with change of anion may be attributed to solid state effects (21,22). Unfortunately, the infrared spectra of these organic ligands have not yet been ass~gned to permit bands other than the carbonyl stretching and N-H stretching frequencies to be considered unambiguously.…”

Section: Table 11mentioning

confidence: 99%