Syntheses, crystal structures and electrochemistry of divalent metal 4-methylbenzenesulfonate complexes with o-phenanthroline

Three new compounds, namely [Mn(phen)(2)(L-2] . EtOH (1), [Zn(phen)(2)(H2O)(2)] 2L . 6H(2)O (2) and [Cd(phen)(2)( H2O)(2)] 2L . 6H(2)O (3), where HL = 4-methylbenzenesulfonic acid and phen = o-phenanthroline, have been synthesized, and their crystal structures determined by X-ray diffraction. In the complexes the metal atoms have two different coordination environments. Complex (1) consists of neutral molecules, [Mn( phen)(2)(L)(2)], in which Mn-II is six-coordinated by four nitrogen atoms from two o-phenanthroline molecules and two oxygen atoms from two sulfonate ions. Complexes ( 2) and ( 3) are isomorphous, each consisting of cationic species [ M( phen) 2( H2O)(2)](2+) [M = Zn (2), Cd (3)], in which M-II is six-coordinated by four nitrogen atoms from two o-phenanthroline molecules and two water molecules. The electrochemical behavior and FT-IR of these compounds were also studied in detail.