MgII, caII, SrII and BaII complexes of 2,3,11,12-tetramethyl (ethyl or p-tolyl)- 1,4,10,13-tetraazacyclooctadeca-1,3,10,12-tetraene

Department of Chemistry, University of Rajasthan, Jaipur-302 004, Rajasthan, India

E-mail : prasadraghunandan@yahoo.com

Manuscript received 22 January 2004, revised 7 January 2005. accepted 30 June 2006

2+2 Cyclocondensation of 1,5-diaminopentane with α-diketones viz. 2,3-butanedione, 3,4-hexanedione or 4,4'dimethylbenzil in the presence of alkaline earth metal ions as templates yields a series of hexa-coordinated complexes of the type [MLX₂] (where M = Mg^II, Ca^II, Sr^II or Ba^II, L = N₄ macrocycle having IS-membered ring and X = Cl or NCS). The resulting complexes have been characterized by elemental analyses, conductance measurements, IR and ¹H NMR spectra.