Title

Magnetic Properties of Some Monomeric and Dimeric Nickel(II) Complexes NiLX2 (L = 2,9-dimethyl-1,10-phenanthroline (dmp), 2,2′-biquinolyl, Bathocuproine; X = Cl, Br, I) and the Crystal Structure of Ni(dmp)I₂

Abstract

The magnetic properties of a series of nickel(II) complexes with the empirical formula NiLX2 are reported and analyzed in terms of their molecular structures. Here L = 2,9-dimethyl-1,10-phenanthroline (dmp), 2,2′-biquinolyl (biq), or 2,9-dimethyl-4,7-diphenylphenanthroline (bathocuproine, bc) and X = Cl, Br, or I. Some of the complexes are known to be dimeric, some monomeric, and Ni(dmp)I2 is shown to be monomeric by crystal X-ray diffraction. Two of the dimeric complexes, [Ni(biq)Cl2]2 and [Ni(dmp)Cl2]2, show significant intramolecular antiferromagnetic interactions, two less strongly linked dimers, [Ni(bc)Cl2]2 and [Ni(dmp)Br2]2, show weaker antiferromagnetism, and one probable dimer, [Ni(bc)Br2]2, is weakly antiferromagnetic. The pseudotetrahedral monomeric complexes Ni(biq)Br2, Ni(biq)I2, Ni(dmp)I2, and Ni(bc)I2 have magnetic properties which qualitatively resemble the weakly antiferromagnetic dimers and are analyzed in terms of spin-orbit coupling. Crystal data for Ni(dmp)I2: NiI2N2C14H12, space group P21/n, a = 8.472 (2) Å, b = 14.248 (3) Å, c = 13.516 (3) Å, β = 102.72 (2)°, V = 1591 Å3, R = 3.5%, 2632 reflections. © 1979 American Chemical Society.

Department(s)

Chemistry

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1979 American Chemical Society (ACS), All rights reserved.


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