Crystal structures and single-crystal electron spin resonance spectra of π–π type molecular complexes of bis(1-methyliminomethyl-2-naphtholato)copper(II)
- 1 January 1994
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 14,p. 2065-2070
- https://doi.org/10.1039/dt9940002065
Abstract
The donor–acceptor molecular complexes of bis(1-methyliminomethyl-2-naphtholato)copper(II)[CuL2] with 7,7,8,8-tetracyanoquinodimethane (tcnq), tetrachloro-1,4-benzoquinone (tcbq) and 1,3,5-trinitrobenzene (tnb), as well as the parent complex have been subjected to single-crystal X-ray diffraction analysis. The molecular complexes [CuL2]·2tcnq and [CuL2]·2tnb crystallize in the triclinic space group P and [CuL2]·2tcbq crystallizes in the monoclinic space group P21/n, the copper atoms of all complexes being positioned at an inversion centre. The molecular complexes showed a typical π–π type structure consisting of alternately stacked π-electron donor (naphthalene moiety of copper complex) and π-electron acceptor (tcnq, tcbq and tnb) along the c axis (needle axis). The ESR spectrum for a copper(II) doped sample of diamagnetic [NiL2]·2tnb showed simple copper quartet lines due to I=. The X-ray analyses indicated that the donor–acceptor interaction operating along the c axis gives a one-dimensional structure consisting of alternately stacked donor and acceptor molecules, but no distinct two-dimensional interaction.Keywords
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