Experimental and theoretical charge density distribution in pigment yellow 101

Hibbs, David, Du, Jonathan James, Váradi, Linda, Tan, Jinlong, Zhao, Yiliang, Groundwater, P. W. and Platts, James Alexis ORCID: https://orcid.org/0000-0002-1008-6595 2015. Experimental and theoretical charge density distribution in pigment yellow 101. Physical Chemistry Chemical Physics 17 (6) , pp. 4677-4686. 10.1039/C4CP04302B

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Abstract

The charge density distribution in 2,2'-Dihydroxy-1,1'-naphthalazine (Pigment Yellow 101; P.Y.101) has been determined using high-resolution X-ray diffraction and multipole refinement, along with density functional theory calculations. Topological analysis of the resulting densities highlights the localisation of single/double bonds in the central C=N-N=C moiety of the molecule in its ground state. The density in the N—N is examined in detail, where we show that very small differences between experiment and theory are amplified by use of the Laplacian of the density. Quantification of hydrogen bonds highlights the importance of the intramolecular N—H…O interaction, known to be vital for retention of fluorescence in the solid state, relative to the many but weak intermolecular contacts located. However, a popular method for deriving H-bond strengths from density data appears to struggle with the intramolecular N—H…O interaction. We also show that theoretical estimation of anisotropic displacements for hydrogen atoms brings little benefit overall, and degrades agreement with experiment for one intra-molecular contact.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry
Subjects:	Q Science > QD Chemistry
Publisher:	Royal Society of Chemistry
ISSN:	1463-9076
Date of First Compliant Deposit:	30 March 2016
Date of Acceptance:	12 January 2015
Last Modified:	07 Nov 2023 16:18
URI:	https://orca.cardiff.ac.uk/id/eprint/69109

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