scholarly journals Spectral Analysis of Azo Derivatives for their Colorimetric Response to some Special Metal Ions

2021 ◽  
Vol 11 (3) ◽  
pp. 3909-3916
Keyword(s):  
Spectral Analysis ◽  
Metal Ions ◽  
Aqueous Medium ◽  
Spectral Data ◽  
Azo Dyes ◽  
Color Change ◽  
Oh Groups ◽  
Sensing Properties ◽  
Colorimetric Response ◽  
Azo Derivatives

The present study describes an efficient chromogenic probing ability possessed by an azo linkage that could sense Ni, Fe, and Co in the semi-aqueous medium. The chromogenic sensing properties of the four azo dyes were studied towards Fe(III), Co(II), and Ni(II) ions, the IR and UV-VIS spectral data revealed that the nitrogen and oxygen atoms of –N=N-, C=O and –OH groups participated in bonding with the metal ions. Also, an obvious change in the color of the azo dyes A and B solution from yellow to dark brown in the case of Fe+2 metal ions and Co+2 and Ni+2 colorless solutions appeared yellowish, while the addition of other metal ions did not cause any color change. These results imply that the two azo dyes are viable, portable chromogenic chemosensors for the detection of Fe (III), Co (II), and Ni (II) ions in various biological and environmental fields.

scholarly journals The effect of pH and transition metal ions on cysteine-assisted gold aggregation for a distinct colorimetric response

RSC Advances ◽  
2021 ◽  
Vol 11 (16) ◽  
pp. 9664-9674
Author(s):  
Trang Thi Thuy Nguyen ◽  
Olivia A. Han ◽  
Eun Bi Lim ◽  
Seungjoo Haam ◽  
Joon-Seo Park ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Transition Metal ◽  
Metal Ions ◽  
Color Change ◽  
Transition Metal Ions ◽  
Effect Of Ph ◽  
Colorimetric Response

Divalent transition metal ions facilitated the aggregation of gold nanoparticles: Fe2+ < Ni2+ < Zn2+ < Co2+ ≪ Mn2+ < Cu2+ at pH 7. The optimized AuNPs-Cu2+ system produced the progressive color change upon the addition of cysteine (0.2–2.0 μM).

scholarly journals Ag-Functionalized Si Nanowire Arrays Aligned Vertically for SERS Detection of Captured Heavy Metal Ions by BSA

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 685
Author(s):  
Ai-Huei Chiou ◽  
Jun-Luo Wei ◽  
Ssu-Han Chen
Keyword(s):  
Heavy Metal ◽  
Raman Scattering ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Great Promise ◽  
Ag Nps ◽  
Water Contact ◽  
Oh Groups ◽  
Si Nanowire

A novel surface-enhanced Raman scattering (SERS)-based probe to capture heavy metal ion (Zn2+) by bovine serum albumin (BSA) using Si-nanowire (SiNW) arrays with silver nanoparticles (AgNPs) was developed. A layer with AgNPs was deposited on the SiNW surface by RF magnetron sputtering for enhancement of SERS signals. Using a high-resolution transmission electron microscope (HRTEM), the observation reveals that the AgNP layer with depths of 30–75 nm was successfully deposited on SiNW arrays. The Ag peaks in EDS and XRD spectra of SiNW arrays confirmed the presence of Ag particles on SiNW arrays. The WCA observations showed a high affinity of the Ag–SiNW arrays immobilized with BSA (water contact angle (WCA) = 87.1°) and ZnSO4 (WCA = 8.8°). The results of FTIR analysis illustrate that the conjugate bonds exist between zinc sulfate (ZnSO4) and –OH groups/–NH groups of BSA. The resulting SiNWs/Ag NPs composite interfaces showed large Raman scattering enhancement for the capture of heavy metal ions by BSA with a detection of 0.1 μM. BSA and ZnSO4 conjugations, illustrating specific SERS spectra with high sensitivity, which suggests great promise in developing label-free biosensors.

Synthesis of N2, N6-bis(5-methylthiazol-2-yl)pyridine-2,6-dicarboxamide fluoroscent sensor for detection of Cu2+ and Ni2+ Ions

Drug Research ◽  
2021 ◽  
Author(s):  
Anuroop Kumar ◽  
Netrapal Singh ◽  
Mordhwaj Kumar ◽  
Uma Agarwal
Keyword(s):  
Spectral Analysis ◽  
Detection Limit ◽  
Metal Ions ◽  
1H Nmr Spectroscopy ◽  
Stoichiometric Ratio ◽  
Selective Detection ◽  
Ft Ir ◽  
Uv Visible ◽  
Complexes With Metal Ions ◽  
Competitive Ions

AbstractThis article reports an amide based Chemosensor used for selective detection of divalent Cu+2 and Ni+2 ions via Fluorescence turn off. The selective sensing ability of Chemosensor was investigated in presence of different metal ions Mg2+, Ag+, Fe2+, K+, Cu2+, Ni2+, Hg2+, Pb2+, Mn2+, Pd2+, Cd2+ and Mn3+ as competitive ions. The receptor i. e. Chemosensor formed complexes with metal ions in 1:1 stoichiometric ratio. The detection limit and binding constant calculated as 1.92×10–4 and 1.4×10–4 M and 2.16×103 M−1 and 3.09×103 M−1 for Cu2+ and Ni2+ions respectively. The complexes were characterized by UV/visible, FT-IR, 13C NMR and 1H NMR spectroscopy. Further the structure and Crystallinity were calculated by P-XRD spectral analysis. The crystallinity found to be 65.27 and 67.87% respectively

1,3,4-Thiadiazole-2,5-dithiol as a complexing agent. Complexes of RuIII, RuII, RhIII, PdIV IrIII and PtIV

1975 ◽  
Vol 28 (4) ◽  
pp. 763 ◽  
Author(s):  
MR Gajendragad ◽  
U Agarwala
Keyword(s):  
Magnetic Susceptibility ◽  
Metal Ions ◽  
Spectral Data ◽  
Crystal Field ◽  
Complexing Agent ◽  
Chemical Analyses ◽  
Infrared Spectral ◽  
Crystal Field Parameters

Complexes of RuIII, RuII, RhIII, PdIV, IrIII and PtIV with 1,3,4-thiadiazole- 2,5-dithiol have been prepared. Probable structures for the complexes have been proposed on the basis of chemical analyses, magnetic susceptibility and electronic and infrared spectral data. Crystal field parameters have been calculated which are in accordance with the structures proposed. In every complex the ligand behaves as a unidentate towards two metal ions.

Surface adhered fluorescent carbon dots extracted from the harmful diesel soot for sensing Fe(iii) and Hg(ii) ions

2021 ◽  
Author(s):  
Gunture ◽  
Jaidev Kaushik ◽  
Deepika Saini ◽  
Ravindra Singh ◽  
Prashant Dubey ◽  
...  
Keyword(s):  
Metal Ions ◽  
Aqueous Medium ◽  
Carbon Material ◽  
Carbon Dots ◽  
Cost Effective ◽  
Diesel Soot ◽  
Isolation Method ◽  
Green Fluorescent ◽  
Fluorescent Carbon Dots ◽  
Fluorescent Carbon

A simple cost effective isolation method has been described for the extraction of surface-adhered blue–green fluorescent carbon material from the diesel soot and used them for the selective sensing of Fe(iii) and toxic Hg(ii) metal ions in aqueous medium.

scholarly journals Desing of optical chemosensors for detection of cyanide ions in water environments

2019 ◽  
Vol 15 (1) ◽  
pp. 82-87
Author(s):  
Alexandra Alexandrovna Kudrevatykh ◽  
Lyubov Stepanovna Klimenko ◽  
Timofey Petrovich Martyanov
Keyword(s):  
Aqueous Medium ◽  
Absorption Spectra ◽  
Stability Constants ◽  
Molecular Interactions ◽  
Color Change ◽  
Cyanide Ion ◽  
Colorimetric Test ◽  
Optical Chemosensors ◽  
Aqueous Mixture ◽  
The Stability

Molecular interactions with various anions in the form of tetrabutylammonium salts in DMSO and DMSO-aqueous mixture were studied spectrophotometrically. It turned out that the solutions of 1-hydroxy-2-acylaminoanthraquinones in DMSO, originally yellow, became dark purple with the addition of cyanide, fluoride, phosphate, and acetate ions. The addition of other salts did not cause changes in the absorption spectra. When switching to aqueous DMSO, a contrasting color change in the solution was observed only with the addition of the cyanide ion. The stability constants of the complexes and the metrological characteristics of the processes were determined. On the basis of 1hydroxy-2-benzoylaminoanthraquinone, colorimetric test strips were made and tested for the detection of CN-ions in an aqueous medium.

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