Linked Life Data

15148437

Source:http://linkedlifedata.com/resource/pubmed/id/15148437

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
Crystals of C(10)H(8)N(3)O(2)Br undergo two reversible phase transitions between 295 and 100 K. The first, of an order-disorder nature, is a second-order transition and takes place continuously over a wide temperature range. This transition is connected with the doubling of the length of the c axis of the unit cell and with the change of the space group from P2(1)/m with Z' = 1/2 (room-temperature alpha-phase) to P2(1)/c, Z' = 1 (beta-phase, 200-120 K). During this transition the molecule loses the C(s) symmetry of the alpha-phase. The second transition takes place between 118 and 115 K, and is accompanied by a change of the crystal symmetry to the triclinic space group P1; (low-temperature gamma-phase). This second phase transition is accompanied by the twinning of the crystal. Neither the molecular geometry nor the crystal packing shows any dramatic changes during these phase transitions. Halogen bonds C-Br.N and dihalogen interactions Br.Br play a crucial role in determining the crystal packing and compete successfully with other kinds of weak intermolecular interactions.
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
333-42
pubmed:dateRevised
2007-7-24
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
Structural phase transitions, and Br.N and Br.Br interactions in 1-phenyl-2-methyl-4-nitro-5-bromoimidazole.
pubmed:affiliation
Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Pozna?, Poland. mkubicki@amu.edu.pl
pubmed:publicationType
Journal Article