TY - JOUR
T1 - Synergism in multicomponent self-propagating molecular assemblies
AU - Motiei, Leila
AU - Sassi, Mauro
AU - Kaminker, Revital
AU - Evmenenko, Guennadi
AU - Dutta, Pulak
AU - Iron, Mark A.
AU - Van Der Boom, Milko E.
PY - 2011/2/15
Y1 - 2011/2/15
N2 - Multicomponent self-propagating molecular assemblies (SPMAs) have been generated from an organic chromo-phore, a redox-active polypyridyl complex, and PdCl2. The structure of the multicomponent SPMA is not a linear combination of two assemblies generated with a single molecular constituent. Surface-confined assemblies formed from only the organic chromophore and PdCl2 are known to follow linear growth, whereas the combination of polypyridyl complexes and PdCl2 results in exponential growth. The present study demonstrates that an iterative deposition of both molecular building blocks with PdCl2 results in an exponentially growing assembly. The nature of the assembly mechanism is dictated by the polypyridyl complex and overrides the linear growth process of the organic component. Relatively smooth, multicomponent SPMAs have been obtained with a thickness of ∼20 nm on silicon, glass, and indium-tin oxide (ITO) coated glass. Detailed information of the structure and of the surface-assembly chemistry were obtained using transmission optical (UV/Vis) spectroscopy, ellipsometry, atomic force microscopy (AFM), synchrotron X-ray reflectivity (XRR), and electrochemistry.
AB - Multicomponent self-propagating molecular assemblies (SPMAs) have been generated from an organic chromo-phore, a redox-active polypyridyl complex, and PdCl2. The structure of the multicomponent SPMA is not a linear combination of two assemblies generated with a single molecular constituent. Surface-confined assemblies formed from only the organic chromophore and PdCl2 are known to follow linear growth, whereas the combination of polypyridyl complexes and PdCl2 results in exponential growth. The present study demonstrates that an iterative deposition of both molecular building blocks with PdCl2 results in an exponentially growing assembly. The nature of the assembly mechanism is dictated by the polypyridyl complex and overrides the linear growth process of the organic component. Relatively smooth, multicomponent SPMAs have been obtained with a thickness of ∼20 nm on silicon, glass, and indium-tin oxide (ITO) coated glass. Detailed information of the structure and of the surface-assembly chemistry were obtained using transmission optical (UV/Vis) spectroscopy, ellipsometry, atomic force microscopy (AFM), synchrotron X-ray reflectivity (XRR), and electrochemistry.
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U2 - 10.1021/la103936t
DO - 10.1021/la103936t
M3 - Article
C2 - 21128588
AN - SCOPUS:79952915462
VL - 27
SP - 1319
EP - 1325
JO - Langmuir
JF - Langmuir
SN - 0743-7463
IS - 4
ER -