aDepartrnent of Chemistry, University of Allahabad, Allahabad-211 002, Uttar Pradesh, India E-mail : shekhsri@rediffmail. corn; kalarn _ abul@redi ffrnail. corn; abul_ k33@yahoo. corn Departrnent of Chemistry, Bipin Bihari (P .G.) Science College, Jhansi-284 128, Uttar Pradesh, India Manuscript received 12 October 2007, accepted 21 November 2007 A new series of 14- and 15-membered tetrathia macrocyclic complexes, [MLX2] [M = ZnII ; X = Cl or NO3; L = L1 = 1,4,8,11-tetrathiacyclotetradecane; L2

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... 13,14-benzo-1,4,8,11-tetrathiacyclopentadecane; L3 = 3,6,10,13- tetrathiacyclotetradecane-1-ol; L4 = 4,5-benzo-3,6, 10, 13-tetrathiacyclotetradecane-1 ,8-diol; L5 = 4,5, 11, 12-dibenzo3,6,10,13-tetrathiacylotetradecane-1,8-diol] have been prepared. The complexes have been characterized on the basis of elemental analyses, conductivity, IR and X-ray photoelectron spectra. Octahedral structures have been proposed for all the prepared metal complexes.