6533b835fe1ef96bd129e9b2

RESEARCH PRODUCT

Synthesis and structural, spectroscopic and magnetic characterization of iron(II) and iron(III) complexes of N-2-pyridinylcarbonyl-2-pyridinecarboximidate

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Abstract One iron(II) complex of N -2-pyridinylcarbonyl-2-pyridinecarboximidate monoanion (bpca), [Fe(bpca) 2 ]·H 2 O ( 1 ), and three iron(III) complexes, [Fe(bpca)Cl 2 (H 2 O)]·(CH 3 ) 2 CO ( 2 ), [Fe(bpca) 2 ](NO 3 )·1.67H 2 O ( 3 ), [Fe(bpca) 2 ](ClO 4 ) ( 4 ), have been prepared and characterized by means of IR, UV-Vis and EPR spectroscopy and magnetic susceptibility measurements, where appropriate. The crystal structures of 1 – 3 have been determined from single crystal X-ray data, showing that the metallic ions are surrounded in all cases by distorted octahedral coordination spheres. From magnetic measurements it is evident that compounds 1 and 3 are practically in the low-spin state at room temperature, compound 2 is in the high-spin state in all the range of measured temperatures and compound 4 shows spin-crossover behaviour. Crystal data for 1 : space group P 2 1 / c , a =8.827(1), b =8.941(2), c =28.957(4) A, β=95.90(1)°, Z =4; for 2 : space group P 2 1 / c , a =8.293(2), b =13.779(2), c =15.884(4) A, β=98.22(1)°, Z =4; for 3 : space group P 1 , a =8.840(1), b =10.713(1), c =14.989(1) A, α=71.16(1), β=73.43(1), γ=82.67(1)°, Z =2.