Finally, AuNPs stabilized by dodecyldimethylammonium bromide
(DDAB) was synthesized following a modification of a known
procedure,13 and subsequently functionalized via ligand exchange
with 1,2-indanedione analogues 19e24 to afford the corresponding
bi-functional reagents. UVevis spectroscopy and TEM were used to
determine both relative particle size and degree of aggregation of
functionalized AuNPs.14 UVevis spectra showed clear shifts in gold
plasmon band after ligand exchange with respect to the asprepared
DDAB capped AuNP colloids, indicating changes in the
AuNP environment (Fig. 1a). The relative extent of peak broadening
and red/blue shift in gold plasmon band that were observed from
changes in chain length of bi-functional reagents were reasonable
considering the corresponding interparticle separation of AuNPs
(Fig. 1a). Generally, with shorter ligand chain lengths, separation
between particles become smaller (exhibited as aggregation or
even fusion), which increases the electromagnetic coupling between
the particles and results in larger shifts.13,15 For example, the
relative degree of aggregation appeared to be more pronounced for
Finally, AuNPs stabilized by dodecyldimethylammonium bromide(DDAB) was synthesized following a modification of a knownprocedure,13 and subsequently functionalized via ligand exchangewith 1,2-indanedione analogues 19e24 to afford the correspondingbi-functional reagents. UVevis spectroscopy and TEM were used todetermine both relative particle size and degree of aggregation offunctionalized AuNPs.14 UVevis spectra showed clear shifts in goldplasmon band after ligand exchange with respect to the aspreparedDDAB capped AuNP colloids, indicating changes in theAuNP environment (Fig. 1a). The relative extent of peak broadeningand red/blue shift in gold plasmon band that were observed fromchanges in chain length of bi-functional reagents were reasonableconsidering the corresponding interparticle separation of AuNPs(Fig. 1a). Generally, with shorter ligand chain lengths, separationbetween particles become smaller (exhibited as aggregation oreven fusion), which increases the electromagnetic coupling betweenthe particles and results in larger shifts.13,15 For example, therelative degree of aggregation appeared to be more pronounced for
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