DOI: 10.1063/1.441241. Exchange interactions in tropylium bis(1,2-dicyanoethylene dithiolato) nickelate (III)

Exchange interactions in tropylium bis(1,2-dicyanoethylene dithiolato) nickelate (III)

10.1063/1.441241

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

The compound tropylium bis[1,2-dicyanoethylenedithiolato] nickelate (III), i.e., (C7H7)+ [Ni(mnt)2]−, has been prepared and its crystal structure determined; the space group is P21/c, Z=2, the unit cell axes are a=6.364, b=7.458, c=17.991 Å, and β=91.22 °. The Ni(mnt)2− and C7H7+ ions form segregated stacks in the direction of the b axis. This is in contrast with the structure of the analogous thiete complex (C7H7)+ [NiS2C2 (CF3)2]−, in which crystals alternating stacks of cations and anions are present. The susceptibility appears to be dominated by a strong one-dimensional, isotropic, antiferromagnetic exchange coupling (J0=−4.4 cm−1). However, the angular dependence of the EPR linewidth at room temperature has to be explained with an additional anisotropic exchange interaction of 0.26 cm−1. Furthermore, Q-band EPR measurements in the ab plane reveal a very small interstack exchange interaction (0.015 cm−1 at room temperature) which increases by a factor of 4 upon lowering the temperature to 8 K and which might be responsible for a possible long range order at low temperature.

Bibliography

Manoharan, P. T., Noordik, J. H., de Boer, E., & Keijzers, C. P. (1981). Exchange interactions in tropylium bis(1,2-dicyanoethylene dithiolato) nickelate (III). The Journal of Chemical Physics, 74(3), 1980â1989.

Authors 4

P. T. Manoharan (first)
J. H. Noordik (additional)
E. de Boer (additional)
C. P. Keijzers (additional)

References 39 Referenced 37

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Dates

Type	When
Created	22 years, 6 months ago (Feb. 28, 2003, 10:46 a.m.)
Deposited	1 year, 6 months ago (Feb. 9, 2024, 5:20 p.m.)
Indexed	1 year, 6 months ago (Feb. 9, 2024, 5:40 p.m.)
Issued	44 years, 7 months ago (Feb. 1, 1981)
Published	44 years, 7 months ago (Feb. 1, 1981)
Published Print	44 years, 7 months ago (Feb. 1, 1981)

Funders 0

None

BibTeX

@article{Manoharan_1981, title={Exchange interactions in tropylium bis(1,2-dicyanoethylene dithiolato) nickelate (III)}, volume={74}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.441241}, DOI={10.1063/1.441241}, number={3}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Manoharan, P. T. and Noordik, J. H. and de Boer, E. and Keijzers, C. P.}, year={1981}, month=feb, pages={1980–1989} }

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