Synthesis and spectral studies of transition metal complexes with 2,16-dimethyl-3,6,9,12,15,21-hexaaza-bicyclo[15.3.1]henicosa-1 (21),2,15,17 ,19-pentaene

Department of Chemistry, Zakir Husain College (University of Delhi), 1 .L.N. Marg. New Delhi- 110 002. India

E-mail : schandra_00@yahoo.com

Manuscript received 9 December 2002, revised 22 September 2003, accepted 3 May 2004

Complexes of transition metal ions with an azamacrocyclic ligand viz. 2,16-dimethyl-3,6,9,12,15,21-hexaaza-bicyclo[15.3.1]henicosa-1(21),2,15,17,19-pentacne (L¹) have been prepared. All the complexes were found to have the composition ML¹Cl₂ (where M = Mn^II , Co^II , Ni^II and Cu^II or M'L¹Cl₃ (where M' = Cr^lll and Fe^III ). Molar conductance measurements of Mn^II , Co^II and Ni^II complexes in DMSO correspond to 1 : 1 electrolytes, whereas ML¹Cl₃ and CuL¹Cl₂ are 1 : 2 electrolytes. Therefore complexes may be formulated as [ML¹CI]CI, [ML¹CI]Cl₂ and [CuL¹]Cl₂. All the complexes wet·e characterized through elemental analyses, molar conductance and magnetic susceptibility measurements, IR, electronic and EPR spectral studies.