Capture of face-to-face π-interactions via solid-state [2+2] photodimerization

Photodimerization in the Solid State

Following a brief historical review of solid-state photochemistry current research is discussed under four parallel headings: first, analysis of the topochemical postulate according to which the course of the solid-state reaction and the stereochemistry of the photodimer (if any) can be predicted from the configuration and nearest-neighbour geometry of closest monomer molecules in the crystal l...

Analysing Face to Face Computer-mediated Interactions

Detailed analysis of face to face computer mediated interactions implies a study of a corpus composed of the interaction traces produced by the collaborative tool and video and audio recordings. Because of their separate nature, it is frequently difficult to perform this joint analysis. In order to facilitate such analyses we propose a model for describing corpora composed of sources from diffe...

Automatic Face Recognition via Local Directional Patterns

Automatic facial recognition has many potential applications in different areas of humancomputer interaction. However, they are not yet fully realized due to the lack of an effectivefacial feature descriptor. In this paper, we present a new appearance based feature descriptor,the local directional pattern (LDP), to represent facial geometry and analyze its performance inrecognition. An LDP feat...

Unexpected Molecular Flip in Solid-State Photodimerization

Three cocrystals of the light-stable compound 1,1,6,6-tetraphenyl-2,4-hexadiyne-1,6-diol (I) with light-sensitive molecules 1,2-dimethyl-2(1H)-pyridinone (a), 6-methyl-2(1H)pyridinone (b) and 2-methyl-2(1H)-pyridinone (c) were exposed to UV light. It was found that the molecules undergo molecular flip perpendicular to the molecular plane (rotation of ∼180°). In the first two cocrystals, the lig...

Time-varying networks approach to face-to-face empirical interactions