RESEARCH ARTICLE

 

Coordination of tridentate Schiff base derivatives of 4-aminoantipyrine to rhenium (V)

 

 

Kim C. Potgieter^I; Thomas I.A. Gerber^{I, *}; Peter Mayer^II

^IDepartment of Chemistry, Nelson Mandela Metropolitan University, 6031 Port Elizabeth, South Africa
^IIDepartment of Chemistry, Ludwig-Maximilians University, D-81377, München, Germany

 

 

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ABSTRACT

The potentially tridentate Schiff base derivatives H₂nap and Hoap were synthesized by the condensation reaction of 4-amino-2,3-dimethyl-1-phenyl-5-pyrazoline (4-aminoantipyrine)with 2-aminobenzaldehyde and salicylaldehyde, respectively. The reaction of H₂nap with [ReOBr₃(PPh₃)₂] and cis-[ReO₂I(PPh₃)₂](1) gives rise to the products [Re(nap)Br₂(PPh₃)]Br (2) and [ReO(OEt)(Hnap)(PPh₃)]I (3), respectively. In 2 the ligand nap is coordinated as a tridentate imido-imino-ketone, while in 3 Hnap is bonded as an amido-imino-ketone. The reaction of Hoap with [ReO₂I(PPh₃)₂] affords the product [ReO(OMe)(oap)(PPh₃)]I (4). Spectroscopic data and the X-ray crystal structures of compounds 2-4 are reported.

Keywords: Tridentate, rhenium(V), imido, crystal structures

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Received 16 May 2011
Revised 20 July 2011
Accepted 11 November 2011

 

 

Submitted by invitation to celebrate 2011 the 'International Year of Chemistry'.
* To whom correspondence should be addressed. E-mail: thomas.gerber@nmmu.ac.za