Katzin

Bonding effects in circularly dichroic cobalt(III) complexes. L. T. Katzin and I. Eliezer, Coord. Chem. Rev., 1972,7, 331-343 (20). 

Some applications of C.D. measurements to problems in metal ion complexes, using nickel(II) and lanthanides as examples. L. I. Katzin, Coord. Chem. Rev., 1970, 5, 279-292 (12). 

The half-wave potentials of K+, Tl+ and Ca2+ in water are slightly more negative and thosefor Zn2+, Cd2+, Mn2+, Ni2+ and Co2+ considerably more negative than is expected according to the donicity rule. It has been shown in the previous sections that water is a rather unique solvent. The effect in question may be interpreted by the so-called Katzin-effect according to which water forms a royal core of coordinated water molecules which are hooked together by hydrogen bonds 70,71>122,1231. 

Finely divided thorium metal is pyrophoric in air, and thorium ribbon burns in air to give the oxide. The metal also reacts vigorously with hydrogen, nitrogen, the halogens, and sulfur. Thorium compounds are stable in +4 oxidation state (Katzin 1983). Details of thorium chemistry are given by Katzin (1983). 

Katzin LI. 1983. Thorium and thorium compounds. In Grayson M, Eckroth D, eds. Kirk-Othmer encyclopedia of chemical technology, vol. 22, 3rd ed. New York, NY John Wiley and Sons, 989-1002. 

Leonard Katzin I want to make two comments, one on this last point in relation to the point that Dr. Margerum made about substituents. Chromium (I II) in the hexahyd rated state is quite resistant to penetration of the coordination shell by nitrate ion. Yet if one takes the% violet chromium nitrate hexahydrate in solid state and treats it with liquid tributylphosphate, within a matter of minutes one gets chromium compound in solution by the mechanism of substituting tributylphosphate for water. So this reaction is fast. This initial solution is violet Within the space of an hour or two it is green. And we have had for some years now infrared evidence that this color change is accompanied by penetration of the nitrate ion into the coordination sphere (4). So this again is a matter of the substituent s changing the relationship of the water. 

Leonard Katzin My first point refers to the question of the nitrate absorption spectrum. If one goes back a decade or more in the literature, there are observations on this peak of a nitrate in nonaqueous solutions of inorganic salts, and I don t believe that the wave length stays fixed. It shifts toward shorter wave lengths—not a great deal, but perceptibly (5). 

Bacha Kochi Tetrahedron 1968, 24, 2215 Ogibin Katzin Nikishin Synthesis 1974, 889. 

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