Abstract
NMR spectroscopy and quantum chemical calculations were applied for structural characterization and determination of the preferred stereochemical sequence distribution of the monomer units in the homopolymer chains of poly(butyl-α-cyanoacrylate) nanoparticles. The stereochemical sequence distribution of the monomer units was defined by analysis of their high-resolution 1D 1H and 13C NMR and 2D J-resolved, 1H/13C HSQC and 1H/13C HMBC NMR spectra. The results were verified by employment of B3LYP/6-31G(d) calculations and are consistent with the preferred tendency of polymer chains of PBCN to adopt syndiotactic placements. The proton and carbon chemical shielding were calculated at BPW91/6-31+G(2d,p) level using the GIAO approach and B3LYP/6-31G(d) optimized geometry.
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Acknowledgments
Funding of this study by the Bulgarian Fund for Scientific Research, under Grant DO 02-168/2008 is gratefully acknowledged. The quantum chemical calculations were performed on the computer system installed at the Institute of Organic Chemistry, Bulgarian Academy of Sciences with the financial support of the Bulgarian Scientific Research Fund under the Project “MADARA” (RNF 01/0110, contract no. DO 02-52/2008). The NMR spectrometers are part of the National NMR Network and were purchased in the framework of the National Programme for Scientific Re-equipment, contract REDE/1517/RMN/2005, with funds from POCI 2010 (FEDER) and Fundação para a Ciência e a Tecnologia (FCT). The authors are grateful to Dr N. Vasilev, Institute of Organic Chemistry, Bulgarian Academy of Sciences, Sofia for helpful discussions.
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Markova, N., Ivanova, G., Enchev, V. et al. Tacticity of poly(butyl-α-cyanoacrylate) chains in nanoparticles: NMR spectroscopy and DFT calculations. Struct Chem 23, 815–824 (2012). https://doi.org/10.1007/s11224-011-9928-3
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DOI: https://doi.org/10.1007/s11224-011-9928-3