Table 1. IR Spectral Data of PLu and OBB/PLu Oligomers.

samples	functional group	wavenumber (cm–1)	wavenumber (cm–1) (theoretical)
PLu	N–H stretching	3355	3350
	imine stretching	1610	1620
	C=C stretching (quinonoid)	1587 and 1492	1590, 1580, and 1485
	C=C stretching (benzenoid)	1326	1350 and 1320
	C–N stretching	1234	1230
	C–H bending	1110	1120 and 1110
	substituted benzene ring	995	990 and 930
	fused aniline ring of luminol	793	795
OBB/PLu-20/80	N–H stretching	3310	3300
	imine stretching	1624	1628
	C=C stretching (quinonoid)	1587 and 1492	1589 and 1488
	C=C stretching (benzenoid)	1336	1378 and 1330
	C–N stretching	1234	1230
	C–H bending	1109	1090
	substituted benzene ring	887	992
	fused aniline ring of luminol	790	793
OBB/PLu-50/50	N–H stretching	3334 and 3197	3300 and 3093
	imine stretching	1624	1630
	C=C stretching (quinonoid)	1473	1486
	C=C stretching (benzenoid)	1371 and 1324	1369 and 1347
	C–N Stretching	1220	1224
	C–H bending	1120	1090
	substituted benzene ring	887	990
	fused aniline ring of luminol	790	790
OBB/PLu-80/20	N–H stretching	3130	3110
	imine stretching	1610	1639 and 1618
	C=C stretching (quinonoid)	1587 and 1490	1590 and 1486
	C=C stretching (benzenoid)	1332 and 1319	1347 and 1323
	C–N stretching	1224	1224
	C–H bending	1051	1043
	substituted benzene ring	925	920
	aniline ring of luminol	786	790