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Title:	Characterization by fourier transform infrared spectroscopy (FT-IR) and 2D IR correlation spectroscopy of PAMAM dendrimer
Authors:	Popescu, Maria-Cristina; Cruz, C. ; Marcos, Mercedes; Serrano, José Luis
Issue Date:	30-Jun-2006
Publisher:	American Chemical Society
Citation:	Journal of Physical Chemistry B 110(29): 14198-14211 (2006)
Abstract:	FT-IR and 2D correlation spectroscopy were employed to study the microstructural changes ocurring during phase transitions of a liquid crystal poly(amidoamine) codendrimer (PAMAM (L1)16(L2)16) generation 3, functionalized on the terminal groups by one-chain promesogenic calamitic units (4-(4'-decyloxybenzoyloxy)salicylaldehyde (L1)) and two-chain promesogenic calamitic units (4-(3',4'-didecyloxybenzoyloxy)salicylaldehyde (L2)). Spectral modifications associated with molecular conformation rearangements allowing for molecular shape change on going from a liquid−crystalline organization to another were found. The transition temperatures were calculated, and they are in good agreement with the DSC data. Spectral analysis gives evidence of the LC phase transitions and to an additional transition associated with the existence of conformers. Various types of hydrogen bonding have been established.
Description:	et al.
Publisher version (URL):	http://dx.doi.org/10.1021/jp061311k
URI:	http://hdl.handle.net/10261/19124
DOI:	10.1021/jp061311k
ISSN:	1520-6106
Appears in Collections:	(ICMA) Artículos