Synthesis, and Crystal and Molecular Structure of Bis[2-(2-benzoxazolyl)phenolato]nitratoiron(III), Fe(C13H8O2N)2(NO3)

The title complex was newly synthesized and its crystal and molecular structure was determined by the single-crystal X-ray diffraction technique. The crystal is monoclinic, space group C2⁄c, a=16.005(4), b=10.520(2), c=15.338(4) A, β=114.68(2)°, and Z=4. In the complex, the central metal atom is hexa-coordinated being in a deformed octahedral geometry: Two 2-(2-benzoxazolyl)phenolato ligands form six-membered chelate rings being coordinated with their oxazolyl nitrogen and phenolato oxygen atoms, while the nitrate ion acts as a bidentate with its two oxygen atoms. As the benzoxazolyl ring is parallel and overlapped with that of the neighboring complex along the c-axis, where the interplane distance is 3.557 A, some interaction between the rings is expected. As this complex in solid state is deep violet, almost black, in color, some charge-transfer bands are expected to exist in its electronic spectra. The bis[2-(2-benzothiazolyl)phenolato]nitratoiron(III) was found to be isomorphous to the title complex.