title: Electron density studies on hydrogen bonding in two chromone derivatives.
abstract: The experimental electron densities of two chromone derivatives have been determined from X-ray synchrotron diffraction data at low temperature (100 K). Topological analysis of the electron density has been used to analyze the formation of resonance-assisted hydrogen bonds (RAHBs). Geometrical and topological parameters confirm π-electron delocalization within the hydrogen-bonded ring. In addition, weak C-H···O interactions were identified in both structures. Hydrogen-bond energies allowed medium and weak hydrogen bonds to be distinguished.
authors.affiliation: Department of Structural Chemistry and Crystallography, University of Łódź, Tamka 12, Poland. malecka@uni.lodz.pl
authors.forename: Magdalena
authors.initials: M
authors.lastname: Małecka
authors.forename: Lilianna
authors.initials: L
authors.lastname: Chęcińska
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Rybarczyk-Pirek
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Morgenroth
authors.forename: Carsten
authors.initials: C
authors.lastname: Paulmann