Document Detail


Monohydroxamic acids and bridging dihydroxamic acids as chelators to ruthenium(III) and as nitric oxide donors: syntheses, speciation studies and nitric oxide releasing investigations.
MedLine Citation:
PMID:  18399240     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The synthesis and spectroscopic characterisation of novel mononuclear Ru(III)(edta)(hydroxamato) complexes of general formula [Ru(H2edta)(monoha)] (where monoha = 3- or 4-NH2, 2-, 3- or 4-C1 and 3-Me-phenylhydroxamato), as well as the first example of a Ru(III)-N-aryl aromatic hydroxamate, [Ru(H2edta)(N-Me-bha)].H2O (N-Me-bha = N-methylbenzohydroxamato) are reported. Three dinuclear Ru(III) complexes with bridging dihydroxamato ligands of general formula [{Ru(H2edta)}2(mu-diha)] where diha = 2,6-pyridinedihydroxamato and 1,3- or 1,4-benzodihydroxamato, the first of their kind with Ru(III), are also described. The speciation of all of these systems (with the exception of the Ru-1,4-benzodihydroxamic acid and Ru-N-methylbenzohydroxamic systems) in aqueous solution was investigated. We previously proposed that nitrosyl abstraction from hydroxamic acids by Ru(III) involves initial formation of Ru(III)-hydroxamates. Yet, until now, no data on the rate of nitric oxide (NO) release from hydroxamic acids has been published. We now describe a UV-VIS spectroscopic study, where we monitored the decrease in the ligand-to-metal charge-transfer band of a series of Ru(III)-monohydroxamates with time, with a view to gaining an insight into the NO-releasing properties of hydroxamic acids.
Authors:
Darren Griffith; Krystyna Krot; Jedd Comiskey; Kevin B Nolan; Celine J Marmion
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Dalton transactions (Cambridge, England : 2003)     Volume:  -     ISSN:  1477-9226     ISO Abbreviation:  Dalton Trans     Publication Date:  2008 Jan 
Date Detail:
Created Date:  2008-04-10     Completed Date:  2008-04-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101176026     Medline TA:  Dalton Trans     Country:  England    
Other Details:
Languages:  eng     Pagination:  137-47     Citation Subset:  IM    
Affiliation:
Centre for Synthesis & Chemical Biology, Department of Pharmaceutical & Medicinal Chemistry, Royal College of Surgeons in Ireland, 123 St. Stephens Green, Dublin 2, Ireland.
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MeSH Terms
Descriptor/Qualifier:
Bridged Compounds / chemical synthesis*,  chemistry
Hydroxamic Acids / chemistry*
Molecular Structure
Nitric Oxide / chemistry*
Organometallic Compounds / chemical synthesis*,  chemistry
Ruthenium / chemistry*
Spectrophotometry, Ultraviolet
Chemical
Reg. No./Substance:
0/Bridged Compounds; 0/Hydroxamic Acids; 0/Organometallic Compounds; 10102-43-9/Nitric Oxide; 7440-18-8/Ruthenium

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