Table 4.

IR absorption band changes and possible assignment for the metal-free and metal-loaded Serratia sp. strain L2.

FTIR peak	Serratia sp. strain L2
	Metal-free	Metal-loaded	Displacement*	Functional groups	Bond	Assignment
1		663	663	P-NH	NH2	Amine
2		704	704	Monosubstituted (aromatic compound)	C-H out-of-plane-bends	Aromatic
3	719	723	4	1,3-Disubstituted (aromatic compound)	C-H out-of-plane-bend	Aromatic
4		846	846	1,4-Disubstituted (aromatic compound)	C-H out-of-plane-bend	Aromatic
5		909	909	C2H3R	C-H out-of-plane-bends	Alkene
6		1,092	1,092	R-OH	C-O stretches	Alcohol
7		1,435	1,435	C-C	C-C bend	Alkane
8		1,469	1,469	C-C	C-C bend	Alkane
9	2,132	2,134	4	C ≡ C	C ≡ C stretch	Alkyne
10	2,154	2,158	4	C ≡ C	C ≡ C stretch	Alkyne
11	2,195	2,184	11	C ≡ C	C ≡ C stretch	Alkyne
12	2,218	2,214	4	C ≡ C	C ≡ C stretch	Alkyne
13		2,837	2,837	RCHO	C-H stretch	Aldehyde
14	2,851	2,885	34	C-H	C-H stretch	Alkane
15	2,922	2,930	8	C-H	C-H stretch	Alkane
16	2,956	2,960	4	C-H	C-H stretch	Alkane
17		2,986	2,986	P-NH	NH	Amine
18		3,496	3,496	RO-H hydrogen bond	O-H stretch	Hydroxyl
19		3,623	3,623	RO-H free	O-H stretch	Hydroxyl

*IR band shifts in red; new bands in blue.