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Different Types of Nickel, Cobalt, and Manganese Complexes originating from 2‐Imidazolecarboxaldiimine of Triethylenetetraamine
Author(s) -
Shankar Krapa,
Baruah Jubaraj B.
Publication year - 2015
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201500590
Subject(s) - cobalt , nickel , manganese , deprotonation , chemistry , ligand (biochemistry) , divalent , quenching (fluorescence) , cationic polymerization , reactivity (psychology) , inorganic chemistry , intramolecular force , photochemistry , ion , polymer chemistry , stereochemistry , fluorescence , organic chemistry , medicine , biochemistry , physics , receptor , alternative medicine , pathology , quantum mechanics
The reactivity of the 2‐imidazolecarboxaldiimine of triethylenetetraamine (H2imida) towards divalent manganese, cobalt, and nickel ions differs. It forms a cationic nickel(II) complex by acting as a hexa‐dentate ligand, whereas the cobalt(II) complex formation took place by deprotonation of the H2imida forming a neutral complex with imida. Deprotonation of the ligand by H2imida by cobalt(II) ions caused quenching of the fluorescence emission at 312 nm, such a quenching effect was not observed with the nickel ions. On the other hand, a mononuclear manganese(II) complex of a new tetradentate ligand was formed by manganese(II) assisted intramolecular cyclization reactions of H2imida.