Synthesis and characterization of novel series of Fe(II)-mixed ligand complexes involving 2,2′-bipyridyl ligand

•Four new iron complexes were prepared using DABA, 4-Cl-o-PDA, bipy and hzpy.•The complexes are characterized and their CV and TGA were studied.•The complexes act as models for dyes in DSSC.•The geometries are optimized using PM3 and bond lengths and angles are calculated.

Mixed ligand complexes of Fe(II) with 2,2′-Bipyridyl (bipy) and some aromatic amines (L) (L = 3,4-diamino benzoic acid (DABA), 2-hydazinopyridine (hzpy) or 4-chloro-o-phenylenediamine (4-Cl-o-PDA) have been synthesized and characterized using IR, Mass, and UV–Vis spectrometry, magnetic susceptibility and thermal analysis. The complexes have been proved to have an octahedral geometry with equilibrium between high spin and low spin states which is reflected from the values of the μeff (3.34–4.09). The electrochemical properties of these complexes have been studied using cyclic voltammetry. The structure of the Fe(II)-complexes have been geometrically optimized using parameterized PM3 semiempirical method. The photovoltaic performances of the complexes have been tested.

Graphical abstractMixed ligand complexes of Fe(II) with 2,2′-Bipyridyl (bipy) and some aromatic amines (L) (L = 3,4-diamino benzoic acid (DABA), 2-hydazinopyridine (hzpy) or 4-chloro-o-phenylenediamine (4-Cl-o-PDA) have been synthesized and characterized using IR, Mass, and UV–Vis spectrometry, magnetic susceptibility and thermal analysis. The complexes have been proved to have an octahedral geometry with equilibrium between high spin and low spin states which is reflected from the values of the μeff (3.34–4.09). The electrochemical properties of the complexes have been studied using cyclic voltammetry. The structure of the Fe(II)-complexes have been geometrically optimized using PM3 semiempirical method. The photovoltaic performance of the complexes has been tested. The molecular structure of D1 along with the atom numbering scheme (atom colors: Fe(red), N(blue), C(cyan), S(yellow), Cl(white)).Figure optionsDownload full-size imageDownload as PowerPoint slide