Syntheses and characterization of coordination compounds of N-(2-mercaptoethyl)-4-(3' -carboxy-2' -hydroxyphenyl)·2·azetidinone

Department of Chemistry, National Institute of Technology, Kurukshetra-136 119, Haryana, India

E-mail : dkumar-nitk@yahoo.com

School of Coordination Chemistry, D Wing, Ushanagar, Bhandup, Mumbai-400 078, India

E-mail : arunsyamal@yahoo.co.in

Department of Chemistry, Haryana College of Technology & Management, Kaithal-136 027, Haryana, India

department of Chemistry, Shri Krishan Institute of Engineering & Technology, Kurukshetra-136 118,

Haryana, India

Manuscript received 25 February 2009, revised 9 October 2009, accepted 9 November 2009

A dioxane solution of N-(2·mercaptoethyl)·3·carboxy·2·hydroxybenzylldenelmlne, LH₃ (I) on reacting with chloroacetyl cblorlde In the presence of triethylamine, undergoes cyclization to form N·(2·mercaptoethyl)-4-(3'·carboxy· 2'·hydroxyphenyl)·2-azetldlnone, LH₃ (II). A MeOH solution of L'H₃ reacts with Mn^II, Co^II, Nl^II, Cu^II, Zn^II, Cd^II, zrv, MoOf+ and UO 2• Ions to form the complexes [M(LH)-MeOH]₂ (where M = Mn^II, Co^II or NI^II), [Cu(L'H)]₂, [M'(L'H)] (where M' = Zn^II, Cd^II, MoO₂²⁺ or UO₂²⁺) and [Zr(OH)₂(L'H)]_2. The compounds have been characterized on the basis of elemental analyses, molar conductance, molecular weight, spectral (IR, UV-Visible) studies and magnetic susceptibility measurements. L 'H₃ behaves as a dibasic tridentate OON donor ligand In [Cu(L 'H)]₂, while It acts as a dibasic tetradentate OONS donor ligand In rest or the compounds. The complexes [M(L'H).MeOH]₂ (where M = Mn^II, Co^II or Nl^II), [Cu(LH)]₂ and [Zr(OH)₂(L'H}]₂ are dimers, and the complexes [M'(L'H)] (where M' = Zn^II, Cd^II, MoO₂²⁺ or UO₂²⁺) are monomers. The dimeric complex [Cu(L'H)]₂ exhibits subnormal magnetic moment and is involved in antiferromagnetic exchange, while all other complexes are magnetically dilute. The octahedral structure for Mn^II, Co^II, Nl^II, MoO₂²⁺ and for complexes, square planar structure for Cu^II complex, tetrahedral structure for Zn^II and Cd^II complexes, and pentagonal bipyramidal structure for Zr^IV complex have been suggested.