IJSRSET1841205 | Received : 25 January 2018 | Accepted : 08 February 2018 | January-February-2018 [(4) 1 : 755-762 ] © 2018 IJSRSET | Volume 4 | Issue 1 | Print ISSN: 2395-1990 | Online ISSN : 2394-4099 Themed Section : Science 755 Spectroscopic and Biological Studies of 3,5- Dichlorosalicylaldehyde-3-Aminopyridine Schiff Base and their Tellurium(IV) Complexes Gobind Goyat, Anju Malik, Vikas, K. K. Verma, Sapana Garg Department of Chemistry, Maharshi Dayanand University, Rohtak, Haryana, India ABSTRACT 3,5-Dichlorosalicylaldehyde react with 3-aminopyridine to gives monobasic ON bidentate Schiff base ligand (3- APY-{3,5-ClSalH}). TeCl4, ArTeCl3 and Ar2TeCl2: where Ar = 4-methoxyphenyl, 4-hydroxyphenyl, 3-methyl-4- hydroxyphenyl, react with above Schiff base leads to seven new complexes: having formula [TeCl3(3-APY-{3,5- ClSal})], [ArTeCl2(3-APY-{3,5-ClSal})] and [Ar2TeCl(3-APY-{3,5-ClSal})]. The purity of these compounds was estimated by TLC technique, while their structures were supported by elemental analyses, conductance measurement and spectroscopic methods such as 1 HNMR, infrared spectra giving pentacoordinated tellurium centre having Ψ – trigonal bipyramidal geometry. Also, Schiff base ligand and some of their tellurium(IV) complexes display biological activities in vitro against bacteria and fungii. Keywords: 3,5-Dichlorosalicylaldehyde, Bidentate Schiff base, Tellurium(IV) Complexes. I. INTRODUCTION Schiff bases are considered as “privileged ligands” because they are easily prepared by the condensation product of carbonyl groups with amine[1-6]. Some Schiff bases containing nitrogen and other donor atoms are reported to possess antibacterial[1,7-12], antifungal[9-13] and antitumor activities[14,15]. It is reported[1,16] Schiff base containing heteroatom[17,18] and a number of metal complexes of Schiff bases derived from 2-aminopyridine and 2,3- diaminopyridine with o-hydroxybenzaldehyde, p- hydroxybenzaldehyde and p-nitrobenzaldehyde etc. have been reported to possess antimicrobial activity[19-30]. TeCl4 is also known to form adducts with amides[31- 38] and thiourea[39], thus reflecting its acceptor behaviour. Also, aryltellurium(IV) chlorides are known[31-36,40-57] to behave as lewis acids and form complexes with several Nitrogen, Oxygen and Sulphur donor bases. In view of this, we have investigated the reactions of tellurium(IV) chloride and aryltellurium(IV) chlorides with 3,5- dichlorosalicylaldehyde-3-aminopyridine Schiff base (3-APY-{3,5-ClSalH}), to synthesize some new complexes of tellurium(IV). II. METHODS AND MATERIAL All chemicals used were of Analytical Reagent grade. All preparations were carried out under an atmosphere of dry N2 atmosphere. The solvents were purified by standard method[58,59] before use. The purity of compounds was checked by TLC using Silica gel-G (Merck). Melting points were determined in open capillary tube and are uncorrected. Carbon, hydrogen and nitrogen analyses were obtained microanalytically from SAIF, Panjab