(C:N)	deprotonated 6-(1,1-dimethylbenzyl)-pyridine
(C,N,N)	deprotonated 6-(1,1-dimethylbenzyl)-2,2′-bipyridine
(N,N)	2,2′-bipyridine
PBS	Phosphate buffer solution
HEPES	4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid
DFT	Density functional theory
CLS	Compact laser system
AFM	Atomic Force Microscopy
SERS	Surface-enhanced Raman spectroscopy
LSPR	Localized surface Plasmon resonance
NPs	Nanoparticles
AuNPs	Gold nanoparticles
AgNPs	Silver nanoparticles