Document Detail

Dynamics of NO motion in solid-state [Co(tetraphenylporphinato)(NO)].
MedLine Citation:
PMID:  20545325     Owner:  NLM     Status:  MEDLINE    
The temperature dependence of the crystalline phase of (nitrosyl)(tetraphenylporphinato)cobalt(II), [Co(TPP)(NO)], has been explored over the temperature range of 100-250 K by X-ray diffraction experiments. The crystalline complex is found in the tetragonal crystal system at higher temperatures and in the triclinic crystal system at lower temperatures. In the tetragonal system, the axial ligand is strongly disordered, with the molecule having crystallographically required 4/m symmetry, leading to eight distinct positions of the single nitrosyl oxygen atom. The phase transition to the triclinic crystal system leads to a partial ordering with the molecule now having inversion symmetry and disorder of the axial nitrosyl ligand over only two positions. At an intermediate temperature near the transition point, a transition structure in which the ordering observed at lower temperatures is only partially complete has been characterized. The increase in ordering allows subtle molecular geometry features to be observed. The transition of the reversible phase change begins at about 195 K. This transition has been confirmed by both X-ray diffraction studies and a differential scanning calorimetry study.
Laura M Grande; Bruce C Noll; Allen G Oliver; W Robert Scheidt
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  Inorganic chemistry     Volume:  49     ISSN:  1520-510X     ISO Abbreviation:  Inorg Chem     Publication Date:  2010 Jul 
Date Detail:
Created Date:  2010-07-29     Completed Date:  2010-11-23     Revised Date:  2014-09-16    
Medline Journal Info:
Nlm Unique ID:  0366543     Medline TA:  Inorg Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  6552-7     Citation Subset:  IM    
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MeSH Terms
Calorimetry, Differential Scanning
Cobalt / chemistry*
Coordination Complexes / chemistry*
Metalloporphyrins / chemistry*
Models, Molecular
Nitric Oxide / chemistry*
Phase Transition
X-Ray Diffraction
Grant Support
Reg. No./Substance:
0/Coordination Complexes; 0/Metalloporphyrins; 31C4KY9ESH/Nitric Oxide; 3G0H8C9362/Cobalt

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