Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 182, Issue -, Pages 642-651Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.03.062
Keywords
Colorimetric sensor; Schiff base receptor; Cation recognition; Transition metal
Funding
- Ministry of Human Resource Development (MHRD), New Delhi, India
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New sensitive cation receptors 2a and 2b containing oligoether linked Schiff bases were prepared and their ability to calorimetrically sense transition metal ions was investigated. Addition of metal ions to a methanol solution of 2a, 2b can result in an obvious colour change (from colourless to yellowish-brown for Cu2+ and colourless to yellow for CO2+, Ni2+, Cd2+, Zn2+) and UV-vis absorption spectral change in a short time. The colour change and binding ability of receptors with Cu2+ ion are more compare to other ions, the detection limit is allowable to 1.0 x 10(-5) and 1.0 x 10(-6) M level of Cu2+, 1.0 x 10(-4) and 1.0 x 10(-5) M level of Co2+, Ni2+, Cd2+, Zn2+ according to visual colour change and UV-vis spectral change, respectively. This indicated that these two receptors are highly selective for those metal ions over other ions like Ca2+, Mg2+, Mn2+, Hg2+, Cr3+, Fe2+, Pb2+. (C) 2013 Elsevier B.V. All rights reserved.
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