Supporting Information

The Amidine Based Colorimetric Sensor for Fe3+, Fe2+, and Cu2+ in Aqueous Medium

Jitendra Nandrea, Samadhan Patila, Prashant Patila,b, Suban Sahooc, Carl Redshawd, Pramod Mahulikara* and Umesh Patila*

a School of Chemical Sciences, North Maharashtra University, Jalgaon, 425 001, INDIA.

b S.S.V.P.Ss L. K. Dr. P. R. Ghogrey Science College, Dhule-424 001, INDIA.

c Department of Applied Chemistry, S. V. National Institute Technology, Surat-395 007, Gujrat, INDIA.

d Department of Chemistry, University of Hull, Cottingham Road, Hull, HU67RX (UK).

*Corresponding author: Phone No.: +91-257-2257431, Fax No.: +91-257-2258403, E-mail: mahulikarpp@rediffmail.com (Prof. Mahulikar) and udpatil.nmu@gmail.com (Dr. Patil).

FIGURES

Fig. S1 FT-IR spectrum of receptor AM-1

Fig. S2 LC-MS spectra of receptor AM-1

Fig. S3 1H-NMR spectrum of receptor AM-1.

Fig. S4 Benesi-Hildebrand Plot for AM-1 and Fe3+ based on absorption titration data.

Fig. S5 Linear ratio plot for the determination of LOD and LOQ of Fe3+ ions, based on absorption titration data

Fig. S6 Benesi-Hildebrand Plot for AM-1 and Cu2+, based on absorption titration data.

Fig. S7 Benesi-Hildebrand Plot for AM-1 and Fe2+, based on absorption titration data.

Fig. S8 LC-MS Spectrum of AM-1.Cu2+ complex.

Fig. S9 LC-MS Spectrum of AM-1.Fe2+ complex.

Fig. S10 Fluorescence intensity at 305 nm (ex = 277 nm) of AM-1 (5 10-5 M, in methanol) upon addition of 2 equivalents of Fe3+ ions (1 10-3 M, in water) in the presence of 2 equivalents of other background metal ions (1 10-3 M, in water).

Fig. S11 Linear ratio plot for the determination of LOD and LOQ of Fe3+, based on emission titration data.

Fig. S12 Benesi-Hildebrand Plot for AM-1 and Fe3+ based on emission titration data.

Fig. S13 Scatchard Plot for AM-1 and Fe3+ based on emission titration data.

Fig. S14 HOMO and LUMO of (a) AM-1 and (b) AM-1.Fe2+.

Fig. S15 HOMO and LUMO of (a) AM-1.Cu2+ and (b) AM-1.Fe3+.

Table S1 A comparison of receptor AM-1 with reported sensors.

Research Group

Selectivity and Sensitivity for

Ref. No.

U. D. Patil, et. al.

Fe3+, Fe2+, and Cu2+

This paper

M.-H. Jiang, et. al.

Fe3+ and Fe2+

4

P. Chattopadhyay, et. al.

Fe3+ and Fe2+

5

H.-C. Lin, et. al.

Fe3+ and Cu2+

21

Z. Pan, et. al.

Only Fe3+

22

C.-S. Lin, et. al.

Only Fe3+

23

W. He, et. al.

Only Fe2+

24

C. P. Rao, et. al.

Only Cu2+

25

J. F. Callan, et. al.

Fe3+ and Cu2+

26

P. Lu, et. al.

Fe3+ and Cu2+

27

C. Z. Huang, et. al.

Only Fe2+

28

U. D. Patil, et. al.

Cu2+ and I

29

U. D. Patil, et. al.

Only Fe3+

30

3

4000.0

3000

2000

1500

1000

450.0

4.0

10

15

20

25

30

35

40

45

50

55

60

65

70

72.5

cm-1

%T

2854.49

1640.66

1577.88

1530.00

1459.10

1377.09

1321.31

1300.21

1260.50

1151.67

1119.61

1096.42

1006.48

818.97

769.99

722.69

541.87

4000.03000200015001000450.0

4.0

10

15

20

25

30

35

40

45

50

55

60

65

70

72.5

cm-1

%T

2854.49

1640.66

1577.88

1530.00

1459.10

1377.09

1321.31

1300.21

1260.50

1151.67

1119.61

1096.42

1006.48

818.97

769.99

722.69

541.87