Linked Life Data

15148438

Source:http://linkedlifedata.com/resource/pubmed/id/15148438

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
Pt 3
pubmed:dateCreated
2004-5-18
pubmed:abstractText
A new photoactive monoclinic polymorph (gamma-form) of 6-(2',4'-dinitrobenzyl)-2,2'-bipyridine was obtained from an acetone-methanol solution. The crystal structure was compared with those of two polymorphs reported previously (photoactive orthorhombic alpha-form and photoinactive monoclinic beta-form) and with structures of related nitrobenzylpyridines to explain the relation between the structure and photochromism. The comparison of the reaction cavities around the reactive pyridyl-benzyl-nitro fragment among the polymorphs and related nitrobenzylpyridines revealed that a crucial factor for photochromic activity is the rotational freedom of the ortho-nitro group in their crystals and its accessibility from the proton-donor and proton-acceptor sites. This is because the ortho-nitro group should rotate around the N-C bond to transfer a proton from the methylene group to the N atom of the pyridine ring.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0108-7681
pubmed:author
pubmed:issnType
Print
pubmed:volume
60
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
343-9
pubmed:dateRevised
2007-7-24
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
Packing-dependent photochromism: the case of photoinduced intramolecular proton transfer in 6-(2',4'-dinitrobenzyl)-2,2'-bipyridine.
pubmed:affiliation
Department of Chemistry and Materials Science, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8551, Japan.
pubmed:publicationType
Journal Article