Supporting Information of Functionalization of silver nanoparticles with 5-sulfoanthranilic acid dithiocarbamate for selective

colorimetric detection of Mn2+ and Cd2+ ions Vaibhavkumar N. Mehta, Jigneshkumar V. Rohit and Suresh Kumar Kailasa*

Applied Chemistry Department, S. V. National Institute of Technology, Surat-395 007, India 

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Figure S1. (a) UV-visible spectra and photographic images of Ag NPs after functionalization with different concentration of SAA-DTC ligands (0.5 to 3.0 mM). (b) UV-visible spectra and photographic images of bare Ag NPs and SAA-DTC-Ag NPs.

Electronic Supplementary Material (ESI) for New Journal of Chemistry.This journal is © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2016

-NH3484

-OH3013

C=O1740

S=O1344

C-N1216

C-H871

-SH2504

CS-NH1282 C-S

1086

-SH peakdisappeared

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Figure S2. FT-IR spectra of (a) 5-sulfoanthranillic acid (b) SAA-DTC and (c) SAA-DTC-Ag NPs.

Aromatic protons7.0 to 8.2 δ

-NH2 group5.5 δ

-OH and –SO3H groups9.4 δ

-SH group1.2 δ

Aromatic protons7.0 to 8.2 δ

-OH and –SO3H groups9.5 δ

-SH peak disappeared

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Figure S3. 1H-NMR spectra of (a) 5-sulfoanthranillic acid (b) SAA-DTC and (c) SAA-DTC-Ag NPs.

Figure S4. UV-visible absorption spectra of SAA-DTC-Ag NPs at different days from 1 to 7 day.

pH 8.0

pH (2.0-12)

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Figure S5. (a) The UV-visible absorption ratios (A580 nm/A395 nm and A535 nm/A395 nm ) of SAA-DTC-Ag NPs aggregation induced by Mn2+ and Cd2+ ions using PBS pH at 8.0. Photographic images of SAA-DTC-Ag NPs (b) without analyte, in presence of (c) Mn2+ ion and (d) Cd2+ ion at PBS 2.0-12.

Concentration of NaCl (M)

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Figure S6. UV-visible absorption spectra of SAA-DTC-Ag NPs dispersions with increasing concentrations of NaCl from 0.001 M to 1.0 M.

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Figure S7. UV-visible absorption spectra of SAA-DTC-Ag NPs upon the addition of Mn2+ (1 mM) and Cd2+ (1 mM) at PBS pH 8 with and without NaCl (0.1 M).

Figure S8. Calibration graphs plotted between the absorption ratios at (a) A580nm/A395nm and concentration of Mn2+ ion and (b) at A535nm/A395nm and concentration of Cd2+ ion using SAA-DTC-Ag NPs as a colorimetric probe. Error bars show standard deviations between three independent experiments

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