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(Cyclen– and cyclam–pyridine)copper Complexes: The Role of the Pyridine Moiety in Cu II and Cu I Stabilisation
Author(s) -
El Ghachtouli Sanae,
Cadiou Cyril,
DéchampsOlivier Isabelle,
Chuburu Françoise,
Aplincourt Michel,
Roisnel Thierry
Publication year - 2006
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200600297
Subject(s) - chemistry , cyclam , cyclen , pyridine , potentiometric titration , protonation , copper , moiety , stability constants of complexes , crystallography , titration , inorganic chemistry , medicinal chemistry , stereochemistry , metal , organic chemistry , ion , aqueous solution
The protonation constants of cyclen– and cyclam–pyridine [1‐(pyridin‐2‐ylmethyl)‐1,4,7,10‐tetraazacyclododecane ( L 1 ) and 1‐(pyridin‐2‐ylmethyl)‐1,4,8,11‐tetraazacyclotetradecane ( L 2 ), respectively] and the stability constants (log β 110 ) of the corresponding copper complexes ([Cu L 1 ] 2+ and [Cu L 2 ] 2+ ) were determined by potentiometric titrations. The complexes were subsequently isolated and characterised by X‐ray diffraction, UV/Vis spectroscopy and electrochemical studies. The [Cu L 2 ] 2+ complex adopts two distinct and stable geometries ( trans I and III), which mainly differ by the macrocycle configuration. The trans III configurational isomer can be converted into the trans I one by electron transfer. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)