Synthesis and physico-chemical studies of complexes of Co(II), Ni(II), Cu(II) and Hg(II) with some azole based biheterocyclic ligands

Abstract

<span style="font-size:14.0pt;font-family:" times="" new="" roman";="" mso-fareast-font-family:"times="" roman";mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">The biheterocyclic ligands 1,1 '-dimethylene-2, 2 '-bisimidazole [BBIIM, L] and 2-(2'-pyridyl)indole [Pyln, L'] from complexes of the type [Co(L or L')₂X₂], [N i(L or L' )X₂], [Cu(L or L')X₂] and [Hg(L or L' )X₂], X=Cl, NCS. The complexes have been characterised on the basis of elemental analyses, conductivity measurement, magnetic susceptibility measurement [Gouy and YSM (vibrating sample magnetometer) method] and IR-FTIR, electronic, NMR (¹H and ¹³<span style="font-size:14.0pt;font-family:Arial; mso-fareast-font-family:" times="" new="" roman";mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">C) <span style="font-size:14.0pt; font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">and EPR spectral studies. The ¹H and ¹³C NMR signals of the free ligands undergo down field shifts on complexation. The IR-FTIR spectral data reveal the unidentate nature of NCS group, which coordinates to the metal through nitrogen. The high resolution CID mass spectrum of L and EIMS of L' reveal the molecular mass of the ligands and their fragmentation pattern also.</span></span></span>