id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
eurjchem-1100	Witwit, Noora Asaad	Study of the optical properties of poly(vinyl chloride)-4-[(5-mercapto-1,3,4-thiadiazol-2-yl)diazenyl]phenol complexes	2014	5	.pdf	application/pdf	2745	190	67	Absorption and IR spectra of PVC‐L and PVC‐L‐MII. Complex Electronic absorption peaks (nm) Assignment PVC 261 π‐π* PVC‐L 277 π‐π* 289 π‐π* PVC‐L‐Cu 260 π‐π* 266 π‐π* 305 π‐π* 510 d‐d PVC‐L‐Sn 244 π‐π* 267 π‐π* PVC‐L‐Zn 277 π‐π* 285 π‐π* 320 π‐π* Complex IR (cm‐1) Assignment PVC 614 C‐Cl stretching 2910 C‐H stretching PVC‐L 617 C‐Cl 2912 C‐H 1535 N=N 1360 S‐C PVC‐L‐Cu 2910 C‐H (alphatic) 623 C‐Cl 1520 N=N 1330 S‐C 420 Cu‐S 524 Cu‐N PVC‐L‐Sn 2912 C‐H (alphatic) 615 C‐Cl 1512 N=N 1328 C‐S 442 Sn‐S 559 Sn‐N PVC‐L‐Zn 2914 C‐H (alphatic) 615 C‐Cl 1525 N=N 522 Zn‐N 1300 C‐S 436 Zn‐S 522 Zn‐N Figure 1. Allowed direct transition (αhυ)2 vs energy for PVC‐L. Figure 2. Allowed direct transition (αhυ)2 vs energy for PVC‐L‐SnII. As shown in Table 2, the increase of the absorbance in the UV‐range for sample of the modified PVC compared with unmodified PVC can be explained by the formation of conjugation double bonds (band corresponding to π → π* transitions) in the modified polymer resulting from introducing aromatic ring thus, the shifting in the absorbance to longer wavelengths (i.e. the bathochromic effect) is a good evidence that modification.	cache/eurjchem-1100.pdf	txt/eurjchem-1100.txt