Synthesis and Visible Photocatalytic Activities of Poly(aminobenzoic acid)/TiO₂ Nanocomposites

Table 1

The data about UV-visible and FT-IR spectra of the monomers, polymers, and N719 dye.

Sample	Color	UV peak/abs. coef. (nm/L·g^−1·cm^−1)^a	Average value of abs. coef. in 400–600 nm (L·g^−1·cm^−1)	FT-IR vibration band wavenumber (cm^−1)^b,c
PAB	Colourless	280, 222		3364 s 3461 m 3053 m 1686 vs 1626 s 1603 vs 1576 s 1523 m 1443 s 1422 s 1351 s 1296 vs 1201 vw 1130 m 1056 vw 1048 vw 920 m 843 m
MAB	Colourless	319, 254		1624 vs 1567 vs 1527 s 1487 sh 1452 s 1390 vs 1325 sh 1293 m 1150 m 1095 w 1072 w 1005 w 919 m 886 m 790 vs 673 s
OAB	Colourless	336, 248, 223		3495 s 3382 vs 3040 1680 vs 1610 vs 1559 vs 1585 vs 1487 s 1460m 1428 s 1326 s 1241 vs 1164 s 1114 m 1064 w 1026 w 971 w 921 s 764 vs
PPA	Brown	391/24.0, 300/42.7, 206/66.9	9.27	3428 m 3136 m 1692 vs 1638 sh 1629 sh 1579 s 1518 s 1422 m 1385 vs 1344 sh 1292 s 1180 m 1120 m 1155 w 1059 m 1016 w 948 vw 871 w 845 m
PMA	Brown-black	346/28.6, 331/28.7, 221/98.8	6.02	3416 m 3223 m 1697 s 1637 w 1610 sh 1579 s 1516 m 1456 m 1424 w 1385 m 1301 s 1165 w 1108 w 1040 w 1002 vw 915 vw 867 vw 837 w 760 s 683 m
POA	Black	550/7.62, 350/26.0, 215/101.7	9.73	3379 m 3227 m 2611 w 1688 s 1606 s 1567 s 1517 vs 1453 m 1385 m 1247 vs 1167 m 1082 w 1046 w 1003 vw 982 vw 955 vw 756 s 982 vw 871 vw 823 m 756 s
N719	Black	528/5.52, 389/5.42, 311/18.9, 231/16.6	3.74	2964 s 2876 w 2104 vs 1714 s 1611 s 1543 m 1467 m 1437 vw 1406 m 1370 s 1237 s 1149 vw 1021 w

aUV-vis absorption measured in ethanol.
bsh: shoulder.
cvs: very strong; s: strong; m: medium; w: weak; vw: very weak.