Summary.
The complex formation of the chiral antibiotic (–)-7-chlorotetracycline ((–)-CTC) with VO(IV), Cr(III), and Co(II) in methanol/water (80:20 v/v) was studied using circular dichroism. The ligand forms soluble complexes of the composition [VO((–)-CTC)3]2+, [Cr((–)-CTC)(H2O)4]3+, and [Co((–)-CTC)2(H2O)2]2+ as predominat species in acidic solution (pH=3.2–4.9). The CD spectra of the complex ions are interpreted and their formation constants are reported.
Zusammenfassung.
Die Komplexbildung des chiralen Antibiotikums (–)-7-Chlortetracyclin ((–)-CTC) mit VO(IV), Cr(III) und Co(II) in Methanol/Wasser (80:20 v/v) wurde mittels chiroptischer Methoden untersucht. In sauren Lösungen (pH=3.2–4.9) bildet der Ligand vorwiegend Komplexe der Zusammensetzung [VO((–)-CTC)3)]2+, [Cr((–)-CTC) (H2O)4]3+ und [Co((–)-CTC)2(H2O)2]2+. Die CD-Spektren der Komplexionen werden interpretiert und ihre Bildungskonstanten angegeben.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received April 6, 1998. Accepted (revised) July 1, 1998
Rights and permissions
About this article
Cite this article
Ahmad, N., Safder, J. & Munir, C. Circular Dichroism Studies on the Formation of Complexes of (–)-7-Chlorotetracycline with Vanadium, Chromium, and Cobalt. Monatshefte fuer Chemie 130, 267–274 (1999). https://doi.org/10.1007/PL00010207
Published:
Issue Date:
DOI: https://doi.org/10.1007/PL00010207