Nickel complexes magnetic properties, 675

Nickel, tris( 1,10-phenanthroline)-racemization, 24,466 solid state, 467 structure, 64 Nickel(I) complexes magnetic properties, 274 Nickel(II) complexes, 470 allogonism, 207 equilibrium constants solvent effect, 516 isomerism, 184 liquid-liquid extraction, 544 magnetic properties, 274 5-mcrcaptoamine alkydation, 417 photoreactivity, 407... 

Electronic Spectra and Magnetic Properties of Complexes of Nickel(II) ... 

Since the octahedral and tetrahedral configurations have the same number of unpaired electrons (that is, 2 unpaired electrons), we cannot use magnetic properties to determine whether the ammine complex of nickel(II) is Octahedral or tetrahedral. But we can determine if the complex is square planar, since the square planar complex is diamagnetic with zero unpaired electrons. 

Evidence for the square configuration for [Ni(CN)4]— and other complexes of quadriligated nickel(II) was provided in 1931 only by the magnetic properties of salts containing this ion and by the observed... 

The theory of the magnetic susceptibility of nickel(II) complexes is well established and several review articles have already appeared.375-379 A quantity of interest in studying the magnetic properties of nickel(II) complexes is the effective magnetic moment p = (8xT). 

Many types of ligand have been designed or are known to favour the formation of di- and tri-nuclear nickel complexes. This field of coordination chemistry has recently been extensively reviewed.2590,2591 For a specific discussion of the magnetic properties of dinuclear nickel(II) complexes, see Section 50.5.10. 

The phenomenon of spin equilibrium in octahedral complexes was first reported by Cambi and co-workers in a series of papers between 1931 and 1933 describing magnetic properties of tris(iV,iV-dialkyldithio-carbamato)iron(III) complexes. By 1968 the concept of a thermal equilibrium between different spin states was sufficiently well established that the definitive review by Martin and White described the phenomenon in terms which have not been substantially altered subsequently (112). During the 1960s the planar-tetrahedral equilibria of nickel(II) complexes were thoroughly explored and the results were summarized in comprehensive reviews published by Holm and coworkers in 1966 and 1973 ( 79, 80). Also, in 1968, Busch and co-workers... 

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