Iron(III) complexes of bis (benzimidazol-2-yl) methyl) thiophene-2,5-dicarboxamide: Synthesis, spectral and oxidation of o-phenylenediamine - Tyagi, Nidhi; Mathur, Pavan (Spectrochimica Acta Part A: Molecular & Biomolecular Spectroscopy, 2012)