Supporting information of Cyclen dithiocarbamate functionalized silver nanoparticles as a probe for colorimetric sensing of thiram and paraquat pesticides via host-guest chemistry Jigneshkumar V. Rohit and Suresh Kumar Kailasa * Department of Applied Chemistry, S. V. National Institute of Technology, Surat , India * Corresponding author, Phone: ; Fax: Fig. S1. (a) Schematic representation for preparation of CN-DTC-Ag NPs and (b) UV-Vis spectral study for different volumes of CN-DTC (100 µL to 500 µL) on Ag NPs. (a) CS 2 DTC-CN CN-DTC-Ag NPs (b)

Bare Ag NPs CN-DTC- Ag NPs Fig. S2. UV-Vis absorption spectra of bare Ag NPs and CN-DTC-Ag NPs. (Inset: photograph of bare Ag NPs and CN-DTC-Ag NPs)

(b) Fig. S3. FT-IR spectra of (a) CN (b) CN-DTC and (c) CN-DTC-Ag NPs. (a) (c)

(a) (b) Fig. S4. 1 H NMR spectra of (a) pure CN and (b) CN-DTC.

(a) (c) Fig. S5. FT-IR spectra of CN:CS 2 (a) 1:0.5, (b) 1:1 and (c) 1:1.5 (b) -N-H stretching -N-H wagging

Fig. S6. Structure of pesticides which were used for selectivity study using CN-DTC-Ag NPs.

(a) (b) Fig. S7. Effect of pH on UV-Vis absorption spectra of CN-DTC-Ag NPs using PBS buffer (pH 2.0 – 10.0) and without buffer for (a) thiram and (b) paraquat.

Fig. S8. The calibration graph between absorbance ratio (a) at A 530 /A 396 with different concentration of thiram (10.0 µM to 20.0 µM) and (b) at A 510 /A 396 with different concentration of paraquat (50.0 µM to 250 µM). (a) (b)