ISSN:
0018-019X
Keywords:
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Charge Transfer Compounds of Metal Complexes. I. Bis(o-phenylenediamido)-Nickel Complexes as DonorsThe synthesis of monosubstituted bis(o-phenylenediamido)-nickel complexes NiL2=Ni(C6H3(NH)2R)2 where R = H, OCH3, Cl, sec-butyl, and of the disubstituted complex Ni(C6H2(NH)2 (CH3)2)2 is described. Substitution has a strong influence on the polarographically investigated reduction/oxidation behaviour of the complexes. Reaction of the nickel complexes with strong electron acceptors A (A = chloranil, tetracyanoethylene, 2,3-dichloro-5,6-dicyano-p-benzoquinone, 7,7,8,8-tetracyanoquinodimethane) yields solid compounds with a stoichiometric composition NiL2: A = 1:1. IR. And UV./VIS. Spectroscopic data indicate an ionic ground state of the solids. Electrical conductivities of solids are in the range 4,3·10-3 ω-1 cm-1 to 5·10-12 ω-1 cm-1 at 298 K with activation energies of 0.33 eV to 1.68 eV.In some cases solution equilibria in acetone or dichloromethane have also been investigated. The general scheme is: The tight ion pair NiL2+A- gives no ESR.-signal. Low temperatures or addition of R4NClO4 salts favour the formation of the ionic species.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/hlca.19770600824
Permalink