Synthesis and Structural Studies on Some Transition Metal Complexes Derived from Substituted Symmetric Triazines
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Date
1999-06
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Addis Ababa Universty
Abstract
Co (II), Ni(Il), Cu(II) and Zn(II) complexes of herbicidally active AZIPROTRYN (AZP) and
Hydrazinoethanol derivative of atrazine (HEATZ) have been synthesized from methanolic
media at pH " 6. They have been characterized on the basis of analytical, thermal,
conductance, IR spectral and electronic spectral studies. The studies show that the complexes
are stable to atmospheric conditions and are electrolytes. The metal to ligand ratios are 1:2
and 1: 1, respectively, for AZP and HEATZ. IR studies show that AZP is a neutral NN donor
while HEATZ is a monobasic ONN donor with characteristic alkoxide bridging. Azido
nitrogen and ring nitrogen centres in AZP and alkoxide oxygen, hydrazinonitrogen and ring
nitrogens in HEATZ have been identified as binding centres. In HEATZ alkoxide bridging
is a notable feature due to which the complexes achieve dinuclearity. Tetrahedral geometry
for Co(Il), Ni(H) and Zn(H) complexes and Equ<:rc plnnar geometry 'for eu(n) conipieicof AZP have been proposed. Based on electronic spectral studies, Co(H), Ni(H), CU(ll)
complexes with the composition [M2L2(H20),lCI2 (L = HEATZ) have been adjudged
octahedral.
Thermochromism has been observed with cobalt (II) complex of HEATZ. It is pink in
colour at room temperature, but changes to green through a transient blue colour as it is
heated to 220°C.
Preliminary antimicrobial studies on E. coli and S. aureus have been done using AZP, ATZ,
HEATZ, metal salts, complexes and related compounds
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Keywords
Co (II), Ni(Il), Cu(II) and Zn(II)