Table 5.

IR absorption band changes and possible assignment for the metal-free and metal-loaded Raoultella sp. strain L30 strain.

FTIR peak	Raoultella sp. strain L30
	Metal-free	Metal-loaded	Displacement*	Functional groups	Bond	Assignment
1		678	678	C2H2R2	C-H out-of-plane bend	Alkene
2	734	738	4	Monosubstituted (Aromatic Compound)	C-H out-of-plane bends	Aromatic
3	805	809	4	C2HR3	C-H out-of-plane bends	Alkene
4	846	848	2	1,4-Disubstituted (Aromatic Compound)	C-H out-of-plane bends	Aromatic
5	887	886	1	C2H2R2	C-H out-of-plane bend	Alkene
6		1,066	1,066	(RCO)2O	C-O stretch	Carbonyl
7		1,260	1,260	R-OH	C-O stretches	Alcohol
8	1,461	1,465	4	C-C	C-C bend	Alkane
9		1,562	1,562	P-NH2	NH2	Amine
10		1,640	1,640	R2C=NR or R2C=NH	C=N stretch	Imine and Oxime
11		2,147	2,147	C ≡ C	C ≡ C stretch	Alkyne
12		2,162	2,162	C ≡ C	C ≡ C stretch	Alkyne
13	2,188	2,190	2	C ≡ C	C ≡ C stretch	Alkyne
14		2,210	2,210	C ≡ C	C ≡ C stretch	Alkyne
15		2,230	2,230	C ≡ C	C ≡ C stretch	Alkyne
16		2,840	2,840	RCHO	C-H stretch	Aldehyde
17	2,855	2,859	4	C-H	C-H stretch	Alkane
18	2,922	2,930	8	C-H	C-H stretch	Alkane
19		2,986	2,986	P-NH	NH	Amine
20		2,997	2,996	P-NH	NH	Amine
21		3,493	3,493	RO-H hydrogen bond	O-H stretch	Hydroxyl
22		3,586	3,586	RO-H free	O-H stretch	Hydroxyl

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