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POSS-based polyionic liquids for efficient CO2 cycloaddition reaction under solvent- and cocatalyst-free conditions at ambient pressure
Longqiang Xiao,a Yiming Lai,a Qianyu Song,a Jingyu Cai,a,b,* Rui Zhao,b,* Linxi Houa,b,c,*
aDepartment of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Fuzhou University, Fuzhou 350116, China
bQingyuan Innovation Laboratory, Quanzhou 362801, China
cFujian Key Laboratory of Advanced Manufacturing Technology of Specialty Chemicals, Fuzhou University, Fuzhou 350116, China
Corresponding author, Email: jycai1991@fzu.edu.cn; 1610977686@qq.com; lxhou@fzu.edu.cn.

Scheme S1. Schmetic illustration of the synthesis of imidazolium ions.

Fig. S1. 1H NMR spectrum of ionic liquids, (a)IL1, (b)IL2 , (c)IL3.

Fig. S2.  PIL2 characters. (a) FT-IR spectra (b) 13C NMR spectrum (c) 29Si NMR spectrum.

Fig. S3.  PIL3 characters. (a) FT-IR spectra (b) 13C NMR spectrum (c) 29Si NMR spectrum.

Fig. S4. XPS spectra of PIL2 (a) XPS spectrum survey, (b) Si 2p, (c) C 1s, (d) N 1s, (e) O 1s and (f) Br 3d of the PIL2.

Fig. S5. XPS spectra of PIL3 (a) XPS spectrum survey, (b) Si 2p, (c) C 1s, (d) N 1s, (e) O 1s and (f) Br 3d of the PIL3.

Fig. S6. (a) PIL2 reaction kinetics, (b) Arrhenius equation equation for PIL2.

Fig. S7. (a) PIL3 reaction kinetics, (b) Arrhenius equation equation for PIL3.

Fig. S8. SEM images after repeated use.

Table S1. Elemental ayalysis result of prepared PILs by XPS test.
	Br 3d (%)	Si 2p (%)	N 1s (%)	O 1s (%)	C 1s (%)	
PIL1	2.33	4.55	5.68	9.14	78.31	
PIL2	2.87	3.11	6.16	7.36	80.49	
PIL3	3.64	3.07	8.62	8.27	76.4	

Table S2. Summary of kinetic parameters for the PIL2 reaction.
T (°C)	Kinetic equation	R2	1/T (K-1)	ln k	
65	y=2.582x+11.217	0.986	0.00296 	1.303 	
75	y=3.676x+17.027	0.959	0.00287 	1.569 	
85	y=5.847x+9.844	0.999	0.00279 	1.861 	

Table S3. Summary of kinetic parameters of PIL3 reaction.
T (°C)	Kinetic equation	R2	1/T (K-1)	ln k	
65	y=3.264x-0.575	0.982	0.00296 	1.303 	
75	y=5.011x-6.545	0.977	0.00287 	1.569 	
85	y=7.846x-6.493	0.966	0.00279 	1.861