STRUCTURE AND CHARACTERIZATION OF A 2D COBALT(II) COMPLEX [Co(L)
2]
n
(L = 3-NITRO-5-(pyridine-4-YL)BENZOATE)
D.-Y. Ma, H.-F. Guo, L. Qin
Zhaoqing University, Zhaoqing, P. R. China
Keywords: cobalt(II) coordination polymer, hydrothermal synthesis, crystal structure, thermal behavior
Subsection: SUPRAMOLECULAR AND NANODIMENSIONAL SYSTEMS
Abstract
The self-assembly of unsymmetrical tecton 3-nitro-5-(pyridin-4-yl)benzoic acid (HL)with cobalt chloride under hydrothermal conditions affords a new 2D coordination polymer [Co(L)
2]
n
(
1, L = 3-nitro-5-(pyridin-4-yl)benzoate), which is characterized by elemental analysis, infrared spectroscopy, thermogravimetric analysis, powder X-ray diffraction analysis, and single crystal X-ray diffraction. Compound 1 is of the triclinic system, space group
P-1 with
a = 9.7857(12) Å,
b = 10.3417(13) Å,
c = 10.8463(13) Å, α = 85.155(2)°, β = 74.785(2)°, γ = 88.962(2)°,
V = 1055.4(2) Å
3. The crystal structural analysis of complex
1 shows that the cobalt center is six-coordinated in an octahedral geometry by four O atoms from four different
L ligands and two N atoms from two different
L ligands; the Co(II) cations are bridged by μ
3-
L into an interesting two-dimensional network structure. It should be pointed out that the thermal analysis results indicate that complex
1 is quite stable up to 420 °C.
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