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Electron Density Investigation of a Push-Pull Ethylene (C14H24N2O2.H2O) by X-ray Diffraction at T=21 K (Articolo in rivista)

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Electron Density Investigation of a Push-Pull Ethylene (C14H24N2O2.H2O) by X-ray Diffraction at T=21 K (Articolo in rivista) (literal)

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Forni A., Destro R. (2003)
Electron Density Investigation of a Push-Pull Ethylene (C14H24N2O2.H2O) by X-ray Diffraction at T=21 K
in Chemistry (Weinh., Print); Wiley-VCH - Weinheim, Wheinheim (Germania)
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http://onlinelibrary.wiley.com.pros.lib.unimi.it/doi/10.1002/chem.200305043/abstract;jsessionid=DBDA22B0363AF506D16D9A1ECB2DA830.d01t03 (literal)

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The electronic features of a strongly twisted push-pull ethylene have been investigated by X-ray diffraction at 21 K. The experimental electron density distribution has been described through a multipole model and analyzed by the quantum theory of atoms in molecules. The particularly low temperature of our experiment, compared with most electron density determinations by X-ray diffraction, allows a more accurate description of this distribution and smaller experimental errors in the derived properties. (literal)

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CNR-ISTM, Istituto di Scienze e Tecnologie Molecolari, via Golgi 19, 20133 Milano (Italy); Dipartimento di Chimica Fisica ed Elettrochimica, Università degli Studi di Milano, via Golgi 19, 20133 Milano (Italy) (literal)

Titolo

Electron Density Investigation of a Push-Pull Ethylene (C14H24N2O2.H2O) by X-ray Diffraction at T=21 K (literal)

Abstract

The electron charge distribution of a strongly twisted push-pull ethylene [PPE, 3-(1,3-diisopropyl-2-imidazolidinylidene)-2,4-pentanedione] has been determined by low temperature (T = 21 K) single-crystal X-ray diffraction analysis. The derived electronic properties are consistent with a zwitterionic molecule, as indicated by a charge transfer of 0.82(16)e from the push to the pull moieties and a charge polarization of 0.29(7)e on the olefinic bond. A dipole moment of 12(3)D has been determined, which compares well with ab initio theoretical results in terms of both modulus and orientation. The second moments, which were also obtained with good precision, characterize PPE as a highly quadrupolar molecule. The special electronic features of the molecule confer particular topological properties to the electron density distribution, as evidenced by comparison with standard organic molecules. The crystallographic asymmetric unit of the present system includes one water molecule, which is hydrogen bonded to PPE. Its topological properties have also been investigated, together with an analysis of the involved hydrogen bonds. (literal)

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