Orientation of 2,6-Dicarbethoxy-3,5-bis(pyridine-3-yl)tetrahydro-1,4-thiazine-1,1-dioxide on Silver Nanoparticles: Surface-Enhanced Raman Spectral Studies

Table 1

Vibrational modes observed for DBTD and its corresponding assignments.

S. no.	nRs cm^−1	SERS cm^−1	Assignments
1	3275		NH stretching mode
2	3069		CH stretching mode
3	2967		Asymmetric CH stretching mode of methylene
4	2878		Symmetric CH stretching mode of methylene
5	1724	1674	C=O stretching
6	1591	1610	C–C and C–N stretching
7	1577	1537	C–C and C–N stretching
8	1449	1493; 1425	C–C and C–N stretching; C–C and C–N stretching
9	1350	1368	Asymmetric S=O stretching
10	1323	1304	Asymmetric SO2 stretching
11	1283	1270	Symmetric SO2 stretching
12	1225	1254	Symmetric Ph–N–Ph stretching
13	1204		C–H in-plane bending mode
14	1185		C–H in-plane bending mode
15	1130	1140	Symmetric S=O stretching
16	1110		Asymmetric C–N–C stretching
17	1041		Ring breathing
18	1030	1028; 982	Ring breathing; Ring breathing
19	902	901	Ring breathing
20	841	860; 877; 722	Symmetric C–N–C stretching; Symmetric C–N–C stretching; CH out-of-plane bending
21	671	695	Symmetric Ph–S–Ph stretching
22	634		In-plane ring deformation
23	610	591	In-plane ring deformation
24	526	547	OSO bending
25	491	503	Out-of-plane ring deformation
26	420	409	Out-of-plane ring deformation