Unusual layer structure in an ion-paired compound containing tetra(isothiocyanate)cobalt(II) dianion and 4-nitrobenzylpyridinium: crystal structure and magnetic properties
H.-Q. Ye, Y.-Y. Li, R.-K. Huang, X.-P. Liu, W.-Q. Chen, J.-R. Zhou, L.-M. Yang, C.-L. Ni
Institute of Biomaterial, South China Agricultural University, Guangzhou, P. R. China
Keywords: 1-(4Вў-nitrobenzyl)pyridinium, tetra(isothiocyanate)cobalt(II) anion, layer structure, magnetic properties
Abstract
A new ion-paired compound [4NO
2BzPy]
2[Co(NCS)
4] (1) ([4NO
2BzPy]
+ = 1-(4'-nitrobenzyl)pyridinium, NCS
- = isothiocyanate) is synthesized and characterized by elemental analysis, IR and UV-Vis spectra, ESI-MS and single crystal X-ray diffraction. Compound 1 is orthorhombic, space group
Pbcn, with
a = 13.188(2) Å,
b = 8.458(1) Å,
c = 29.281(4) Å,
V = 3266.2(7) Å
3,
D
calcd = 1.468 g/cm
3,
Z = 4,
F(000) = 1476,
R
1 = 0.0332. The [Co(NCS)
4]
2- anions form an unusual layer structure by S⋯N and S⋯Co interactions, while the [4NO
2BzPy]
+ cations stack into a 1D column by the
p⋯π stacking interaction in the solid state of 1. A magnetic measurement in the range 2-300 K shows a weak antiferromagnetic exchange with θ = -2.42 K in 1.
|
