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A Very Rigid Bis‐bispidine Tetraazamacrocycle and Its Unusual Copper( II ) Complex
Author(s) -
Comba Peter,
Pritzkow Hans,
Schiek Wolfgang
Publication year - 2001
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/1521-3773(20010702)40:13<2465::aid-anie2465>3.0.co;2-x
Subject(s) - copper , computer science , materials science , metallurgy
The absorption maximum of the orange‐colored copper( II ) complex of the cyclam derivative L, which has two 3,7‐diazabicyclo[3.3.1]nonane units (see picture), occurs at 390 nm. This is the lowest value for a copper( II ) tetraamine known so far, and indicates an extremely strong ligand field. This maximum is shifted by 110 nm (5740 cm −1 , 68 kJ mol −1 ) to lower wavelengths than that of the parent compound [Cu(cyclam)] 2+ ; cyclam=1,4,8,11‐tetraazacyclotetradecane.