EPR, magnetic, and structural investigations on the weak-exchange Heisenberg linear chain bis(N-methylphenazinium) bis(dicyanoethenedithiolato)cuprate(II), [(NMP)2][Cu(mnt)2]

P. Kuppusamy, B. L. Ramakrishna, P. T. Manoharan

Research output: Contribution to journalArticle

24 Scopus citations


The title compound [(NMP)2][Cu(mnt)2] crystallizes in the monoclinic space group P21/n with a = 11.417 (2) Å, b = 8.126 (2) Å, c = 17.674 (7) Å, β = 92.11 (2)°, and Z = 2. The structure, including H, was solved by Patterson and Fourier methods and refined by full-matrix least squares to R = 0.048, based on 1944 observations. The compound forms a kind of mixed stack with a donor-acceptor sequence DAD-DAD along the a axis. The static susceptibility measurements showed the exchange to be weak. Single-crystal EPR in the ac* plane, where the two sites are magnetically equivalent, showed single exchange-narrowed Lorentzian lines with hyperfine dominated line width. The relative magnitudes of various Hamiltonians are ℋZee > ℋex > ℋhyp > ℋdip. The angular dependence of the line width in the ac* plane along with the computed second moments was used to evaluate the high-temperature Fourier components of the autocorrelation function C(t) and C2(t). The computed nonsecular components were shown to follow from either the Blume-Hubbard model with Ĵ = 2100 G or from the Anderson-Weiss model with J = 1175 G.

Original languageEnglish (US)
Pages (from-to)3886-3892
Number of pages7
JournalInorganic Chemistry
Issue number24
Publication statusPublished - 1984
Externally publishedYes


ASJC Scopus subject areas

  • Inorganic Chemistry

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