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Publication Type
Journal Article
UWI Author(s)
Author, Analytic
Bakir, Mohammed A.
Author Affiliation, Ana.
Chemistry
Article Title
Optical, electrochemical and structural studies on the first rhenium compound of di-2-pyridylketonephenylhydrazone (dpkphh), fac-Re(CO)3(dpkphh)Cl
Medium Designator
n/a
Connective Phrase
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Journal Title
Inorganica chimica acta
Translated Title
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Reprint Status
Refereed
Date of Publication
2002
Volume ID
332
Issue ID
1
Page(s)
1-6
Language
n/a
Connective Phrase
n/a
Location/URL
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ISSN
n/a
Notes
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Abstract
fac-Re(CO)3(dpkphh)Cl isolated from the reaction between Re(CO)5Cl and dpkphh in refluxing toluene exhibits rich physico-chemical properties. Spectroscopic measurements on fac-Re(CO)3(dpkphh)Cl revealed strong solvent dependence as manifested by the high sensitivity of its 1H NMR and electronic absorption spectra to solvent variation. Electrochemical measurements on fac-Re(CO)3(dpkphh)Cl in CH2Cl2 show irreversible/quasi-reversible redox processes pointing to electrochemical transformation(s) following electronic-transfer(s). Crystals of fac-Re(CO)3(dpkphh)Cl·CH3CN obtained from an acetonitrile solution of fac-Re(CO)3(dpkphh)Cl are chiral and structural studies show racemic twins of fac-Re(CO)3(dpkphh)Cl.CH3CN with fac-Re(CO)3(dpkphh)Cl molecules in distorted octahedral geometry. The molecules pack shows stacks of well separated strands of fac-Re(CO)3(dpkphh)Cl·CH3CN in double helix formation with a network of hydrogen bonds that include solvent–solute and solute–solute interactions. The interlocked helical structure of fac-Re(CO)3(dpkphh)Cl·CH3CN and weak bond energies of the non-covalent interactions may account for the optical behavior of fac-Re(CO)3(dpkphh)Cl·CH3CN as any slight interaction between this system (fac-Re(CO)3(dpkphh)Cl and surrounding solvent molecules) and its surroundings may disrupt the weak solvent–solute and solute–solute interactions.....
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