Synthesis, crystal structure and characterization of chiral, three-dimensional anhydrous potassium tris(oxalato)ferrate(III)

• Published in: Physica. B, Condensed matter Vol. 407; no. 21; pp. 4208 - 4213
• Main Authors: Saritha, A., Raju, B., Ramachary, M., Raghavaiah, P., Hussain, K.A.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 01.11.2012; Elsevier
• Subjects: Condensed matter; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Crystal structure; Diamagnetism, paramagnetism and superparamagnetism; Distortion; Electron paramagnetic resonance and relaxation; Exact sciences and technology; Inorganic compounds; Magnetic properties; Magnetic properties and materials; Magnetic resonances and relaxations in condensed matter, mössbauer effect; Nonmetals; Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity; Optical properties; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Physical properties; Physics; Potassium; Spectra; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Synthesis; Three dimensional; X-ray diffraction; X-ray diffraction; Inorganic compounds; Optical properties; Crystal structure; Magnetic properties; Potassium compounds; Magnetization; XRD; Absorption coefficients; Iron complexes; High spin states; Paramagnetic materials; Oxalates; Electron paramagnetic resonance; Charge transfer
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2012.07.005

The synthesis, crystal structure and physical properties of chiral, three-dimensional anhydrous potassium tris(oxalato)ferrate(III) [K3Fe(C2O4)3] are described. X-ray analysis reveals that the compound crystallized in the chiral space group P4132 of cubic system with a=b=c=13.5970(2), Z=4. The structure of the complex consists of infinite anionic [Fe(C2O4)3]3− units with distorted octahedral environment of iron surrounded by six oxygen atoms of three oxalato groups. The anionic units are interlinked through K+ ions of three different coordination environments of distorted octahedral, bicapped trigonal prismatic and trigonal prismatic yielding a three-dimensional motif. The two broad absorption bands at 644 and 924nm from UV–vis–NIR transmittance spectra were ascribed to a ligand-to-metal charge transfer. The room temperature crystalline EPR spectra indicate the high-spin (S=5/2) of Fe(III) ion. The vibrating sample magnetometer measurement shows the paramagnetic nature at room temperature. Thermal studies of the compound confirm the absence of water molecule.