The vibrational activity of the CTA⁺ molecule in Au NP solution.

Intensity ratio	I 1085/(I760 + I730)a	I 1300/I1510b	I 1445/I1300c	I 2850/I2930d	I 2892/I2973e	(I2892 + I2890)/(I2973 + I2930)f
Octahedral	1.94	7.86	1.27	1.05	1.598	1.18
Truncated octahedral	6.42	1.25	1.72	1.16	2.095	1.29
Cuboctahedral	2.56	2.98	1.76	1.10	1.669	1.22

^a(Backbone vibrational activity).

^b(Out-of-plane vibrational activity (same directional movement)).

^c(In-plane mode vibrational activity).

^d(C–H stretching activity in backbone (symmetrical)).

^e(C–H stretching activity in backbone (anti-symmetrical)).

^f(C–H stretching activity in backbone (total)).