On the role of data quality in experimental charge-density studies (Articolo in rivista)

Type

• Articolo in rivista (Classe)
• Prodotto della ricerca (Classe)

Label

• On the role of data quality in experimental charge-density studies (Articolo in rivista) (literal)

Anno

• 2004-01-01T00:00:00+01:00 (literal)

Alternative label

• Destro R.; Loconte L.; Lo Presti L.; Roversi P.; Soave R. (2004)
  On the role of data quality in experimental charge-density studies
  in Acta crystallographica. Section A (Online)
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Destro R.; Loconte L.; Lo Presti L.; Roversi P.; Soave R. (literal)

Pagina inizio

• 365 (literal)

Pagina fine

• 370 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 60 (literal)

Rivista

• Acta crystallographica. Section A (Rivista)

Note

• ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• Dipartimento di Chimica Fisica ed Elettrochimica, Universita di Milano (Destro, Loconte, Lo Presti) Department of Biochemistry, Laboratory of Molecular Biophysics, University of Oxford (Roversi) Istituto di Scienze e Tecnologie Molecolari, CNR Milano (Soave) (literal)

Titolo

• On the role of data quality in experimental charge-density studies (literal)

Abstract

• High-resolution X-ray diffraction data were collected at T = 19 K from two similar spherical crystals of the fungal metabolite citrinin, C13H14O5. The two data sets were of markedly different quality, one data set (MQ, medium quality) comprising a single octant of the reciprocal lattice and including reflections with obviously peculiar intensity profiles while the second (HQ, high quality) comprised a hemisphere of reflections and showed no flawed profiles. Parallel multipolar refinements were carried out for both. While most of the resulting geometric parameters, including bond lengths and angles, were in close agreement (the standard uncertainties were approximately twice as large for the MQ data, reflecting the smaller number of observations), the agreement is noticeably worse for electronic properties such as electron densities and their Laplacians at the bond and ring critical points. These latter features are especially sensitive to the quality of the low-angle (and strong) intensities, which was not high for the MQ data. By contrast, the magnitudes of the molecular dipole moment from the two experiments are the same within 1 standard uncertainty, with an angle of about 13deg between the two vectors. It is concluded that only true high-quality data allow a fully significant and quantitative analysis of the details of the experimental electron density rhoexp, while high-resolution medium-quality data, measured at very low temperature and adequately processed, can still be used for a qualitative analysis, or for the derivation of overall electronic properties. (literal)

Prodotto di

• Nanoingegneria chimica sperimentale e teorica: analisi di distribuzioni di densita' elettronica con metodi computazionali innovativi e tecniche di diffrazione di raggi X ad alta risoluzione. (PM.P07.002.001) (Modulo)
• Institute of molecular science and technologies (ISTM) (Istituto)

Autore CNR

• RAFFAELLA SOAVE (Unità di personale interno)

Incoming links:

Prodotto

• Institute of molecular science and technologies (ISTM) (Istituto)
• Nanoingegneria chimica sperimentale e teorica: analisi di distribuzioni di densita' elettronica con metodi computazionali innovativi e tecniche di diffrazione di raggi X ad alta risoluzione. (PM.P07.002.001) (Modulo)

Autore CNR di

• RAFFAELLA SOAVE (Unità di personale interno)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• Acta crystallographica. Section A (Rivista)