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The polymeric Co(Ⅱ) complex[Co(Hdhpc)(py)]_n(1)(py = pyridine,H_3dhpc =2,6-dihydroxypyridine-4-carboxyl acid) was prepared and characterized.X-ray diffraction data revealed that the compound crystallizes in dimorphic 1α and 1β forms at room and low temperature,respectively.The former crystallizes in the orthorhombic crystal system,space group Pbcm with a =7.209(1),b = 14.834(3),c = 15.376(3) ?,V= 1644.3(5) ?~3,Z = 4,C_(16)H_(13)CoN_3O_4,M_r = 370.22,D_c= 1.496 g/cm~3,F(000) = 756,μ = 1.068 mm~(-1),R = 0.0633 and wR = 0.1192.While 1β is attributed to the monoclinic space group C2/c with a = 32.102(4),b = 7.022,c = 14.945(2) ?,β = 109.052(5)°,V= 3184.4(6) ?~3,Z= 8,D_c= 1.544 g/cm~3,F(000) = 1512,μ = 1.103 mm~(-1),R = 0.0428 and wR =0.0797.The conformation changes of pyridines between Co-citrazinate planes leading to a reversible single-crystal to single-crystal transformation.The variable temperature magnetic data indicate a weak ferrimagnetism.
The polymeric Co (Ⅱ) complex [Co (Hdhpc) (py)] _ n (py = pyridine, H_3dhpc = 2,6-dihydroxypyridine-4-carboxyl acid) was prepared and characterized. X- the compound crystallizes in a room and low temperature, respectively. The former crystallizes in the orthorhombic crystal system, space group Pbcm with a = 7.209 (1), b = 14.834 (3), c = 15.376 , V = 1644.3 (5) ~ 3, Z = 4, C_ (16) H_ (13) CoN_3O_4, M_r = 370.22, D_c = 1.496 g / cm_3, F (000) = 756, μ = 1.068 mm (-1), R = 0.0633 and wR = 0.1192.While 1β is attributed to the monoclinic space group C2 / c with a = 32.102 (4), b = 7.022, c = 14.945 (2) 5) °, V = 3184.4 (6)? ~ 3, Z = 8, D_c = 1.544 g / cm ~ 3 and F = 0008 = 1512 and μ = 1.103 mm -1, R = 0.0428 and wR = 0.0797. The conformation changes of pyridines between Co-citrazinate planes leading to a reversible single-crystal to single-crystal transformation. Variable temperature magnetic data indicate a weak ferrimagnetism.