Effect of complexation on herbicidal character of Metribuzin with copper(II)

University Department of Chemistry, Magadh University, Bodh Gaya-823 234, Bihar, India

E-mail : sharma.shivadhar@gmail.com

Manuscript received 06 June 2016, revised 16 January 2017, accepted 16 March 2017

Metribuzin derived from precursor triazinone i.e. 4-amino-6-tert.-butyl-3-mercapto-1,2,4-triazine-5- one has been used for complexation with copper(II) with emperical formula [Cu(M BN)₂X₂ ] where MBN is Metribuzin i.e. 4-amino-6-tert.-butyl-3-methylthio-1,2,4-triazine-5-one and X stands for Cl^– , Br^– , NO₃^– , CH₃COO^– and ClO₄^– . The newly synthesized complexes have been characterized by microanalysis, IR spectroscopy, molar conductivity, magnetic moment and electronic spectra. The various crystal field parameters like D_q(xy), D_(qz), D_s and D_t have been derived from their electronic spectra. The positive values of D_s and D_t are indicative of tetragonal elongation along Z-axis of octahedral symmetry of copper(II) complexes. The herbicidal character of copper(II) complexes has been compared with that of Metribuzin and it has been inferred from the results that herbicidal character of Metribuzin gets enhanced in copper(II) complexes.