Please use this identifier to cite or link to this item:
https://hdl.handle.net/10316/17949
Title: | Dimer formation in nicotinamide and picolinamide in the gas and condensed phases probed by infrared spectroscopy | Authors: | Borba, Ana Albrecht, Merwe Gómez-Zavaglia, Andrea Lapinski, Leszek Nowak, Maciej J. Suhm, Martin A. Fausto, Rui |
Issue Date: | Oct-2008 | Publisher: | Royal Society of Chemistry | Serial title, monograph or event: | Phys. Chem. Chem. Phys | Volume: | 10 | Abstract: | Aggregation of nicotinamide (3-pyridine-carboxamide; NA) and picolinamide (2-pyridine-carboxamide; PA) has been investigated by matrix-isolation, supersonic jet and neat solid state infrared spectroscopy, complemented by DFT(B3LYP)/6-311++G(d,p) calculations. For both compounds, the most stable dimeric structure was shown to be the centrosymmetric dimer where two monomers in their most stable forms establish two NHOC hydrogen bonds. The most stable structures of monomers of NA and PA were characterized in detail experimentally by matrix-isolation spectroscopy and theoretically (at both the DFT(B3LYP)/6-311++G(d,p) and MP2/6-311++G(d,p) levels). For nicotinamide, two conformers were found in the matrices, with ca. 80% of the total population adopting the E form. The monomers and dimers of PA and NA were also investigated by infrared spectroscopy of the studied compounds seeded in supersonic jet expansions. These studies revealed that the constraints on the vibrational dynamics in the PA dimer are different from those in the NA dimer. In the PA dimer, the vibrational energy flow out of the N–H stretching mode was shown to be accelerated substantially by the presence of a secondary intramolecular hydrogen bond. In the glassy state of both compounds, the centrosymmetric dimer seems to be the prevalent structure. In the neat crystalline state (KBr pellet), picolinamide keeps this type of dimeric structure as the constituting unit, whereas nicotinamide molecules assume a different arrangement where one of the NHOC bonds is replaced by an NHN(ring) bond. The different crystallograpic structures which were formed by the compounds are reflected in the vibrational spectra of the solids. These observations are correlated with the molecular properties of NA and PA, in particular with the greater conformational mobility of NA compared with PA. This is ascribable to the absence in the NA molecule of the intramolecular NHN(ring) interaction, which exists in PA | URI: | https://hdl.handle.net/10316/17949 | DOI: | 10.1039/B810002K | Rights: | openAccess |
Appears in Collections: | FCTUC Química - Artigos em Revistas Internacionais |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
PCCP, 10 (2008) 7010.pdf | 793.45 kB | Adobe PDF | View/Open |
SCOPUSTM
Citations
28
checked on Feb 18, 2020
WEB OF SCIENCETM
Citations
5
49
checked on Oct 2, 2024
Page view(s)
365
checked on Oct 16, 2024
Download(s) 20
976
checked on Oct 16, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.