A novel selective colorimetric chemosensor for cobalt ions in a near perfect aqueous solution

Hybrid poly(ether-arylidene-ether-sulphone)s derivatives for divalent cobalt ion detection

“…The possible interaction on bonding mechanism between Co +2 ions and copolymer 8 e was explained in this Scheme 1. As obtained, the current response of the copolymer 8 e fabricated GCE was increased (π-π as well as π-π* interaction) with the increasing of Co +2 ionic concentration in the bulk solution, however similar phenomena for toxic chemical detection have also been reported earlier [48][49][50][51][52][53][54][55]. For a low concentration of Co +2 ions in buffer medium, there was a smaller surface coverage of Co +2 ions on copolymer 8 e /binder/GCE and hence the surface reaction proceeds steadily.…”

“…8b, the response time was around 18.0 s, that means, this time was necessary to find steady state detection of Co +2 ion in phosphate buffer system with pH value of 7.0. Thus, with this study, the data recording time was set as 20.0 s. Table 4 showed the comparison of sensor performances based on various modified electrodes [48][49][50][51][58][59][60][61][62][63][64][65][66][67]. Therefore, the proposed cationic sensor based on copolymer 8 e /binder/ GCE was very simple and reliable for selective detection of Co +2 ion in neutral buffer medium for the safety of environment.…”

“…Much more interest expected by the synthesis of separated aromatic polyether sulfone and their copolymers together with other building blocks in the main polymers chain [30,32]. On the other hand, cobalt is found in soil, sea water, rocks and mineral as a trace amount [33], which is very essential for industries as well as for the biological system. Therefore, a trace amount of cobalt is necessary for many living organism including with human.…”

Fabrication of Sb3+sensor based on 1,1′-(-(naphthalene-2,3-diylbis(azanylylidene))bis(methanylylidene))bis(naphthalen-2-ol)/nafion/glassy carbon electrode assembly by electrochemical approach

“…Since Schiff bases are known by their strong coordinative ability as a family of ligands, with the formation in most cases of 1 : 1 transition metal complexes, 23 they have been used to develop various chemosensors. [24][25][26] Chemosensors can be classied into three categories according to the nature of the signal emitted by the signaling subunit: (i) colorimetric sensors related to change in electronic properties in the form of intra/intermolecular charge transfer (ICT), [27][28][29] (ii) uorogenic sensors related to photoinduced electron transfer (PET), 27,30 excited-state intramolecular proton transfer (ESIPT), 31 uorescence resonance energy transfer (FRET), 32,33 bond energy transfer (TBET), 34 excimer-exciplex formation, 35 etc., and (iii) electrochemical sensors related to measurement of changes in redox potential or electrical responses. Because of the great worth and commercial applications of the Schiff bases, the intention of this study is to design an ion-selective cationic electrochemical sensor based on a newly synthesized, non-reported Schiff base as tetradentate ligand in order to probe heavy metal ions in an aqueous system by electrochemical approach.…”

Determination of Fe2+ and Co2+ by a Multiple‐Target Colorimetric Chemosensor with Low Detection Limit in Aqueous Solution

“…Cobalt is a common earth element that can be found in environment . It is an indispensable component of vitamin B12 and has a significant performance in iron metabolism .…”