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A modern approach for the sensing of aqueous Al(III) ion by Ni(II) Salen‐type Schiff base complexes
Author(s) -
Mohan Nithya,
S. S. Sreejith,
Begum P.M. Sabura,
Kurup M.R. Prathapachandra
Publication year - 2019
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.5064
Subject(s) - chemistry , schiff base , diimine , transmetalation , aqueous solution , metal , ion , metal ions in aqueous solution , coordination geometry , inorganic chemistry , crystallography , photochemistry , molecule , catalysis , organic chemistry , hydrogen bond
In this work, we explore a modern concept of transmetalation (metal exchange) for the effective recognition of aqueous Al(III) ion. Three different Ni(II) salen‐type Schiff base complexes with different spacer diimine groups were prepared for the metal exchange reaction. These probes recognize Al(III) both colorimetically as well as fluorimetrically. The efficiency in sensing is mainly due to the low emission characteristics of the respective Ni(II) complexes which results in enhanced emission on the formation of Al(III) complex. The geometry of the central Ni(II) metal ion in the probe plays a pivotal role in the sensing action with the highest sensitivity being shown by the Ni(II) metal center with distorted square pyramidal geometry. Further DFT calculations and the energetics involved in the sensing mechanism via the formation of Al(III) complexes substantiates the experimental results.