Excitation wavelength-dependent emissions of the 4-hydroxy benzohydrazide-based biopolymer/O-carboxymethyl chitosan Schiff Cu(ii) complexes.

Name of the compounds	Catalytic dosage (mg)	Excitation wavelength λexi (nm)	Emission wavelength λemi (nm)	Stokes shift	PL intensity
[(SB1)–Cu(OAc)2]	2	386	442	56	793	Increase
	4	385	440	55	921
	6	420	477	57	322	Decrease
	8	423	476	54	265
[(SB2)–Cu(OAc)2]	2	398	452	51	469	Increase
	4	399	451	52	588
	6	400	450	50	612
	8	405	454	49	377	Decrease