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Study of Copper(II) Polyazamacrocyclic Complexes by Electronic Absorption Spectrophotometry and EPR Spectroscopy
Author(s) -
Geraldes Carlos F. G. C.,
Marques M. Paula M.,
Castro Baltazar de,
Pereira Eulália
Publication year - 2000
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/(sici)1099-0682(200003)2000:3<559::aid-ejic559>3.0.co;2-j
Subject(s) - electron paramagnetic resonance , chemistry , copper , aqueous solution , spectrophotometry , spectroscopy , absorption spectroscopy , absorption (acoustics) , metal , dodecane , crystallography , ultraviolet visible spectroscopy , analytical chemistry (journal) , nuclear chemistry , inorganic chemistry , nuclear magnetic resonance , organic chemistry , chromatography , physics , quantum mechanics , acoustics
Copper(II) mononuclear complexes with the polyazamacrocyclic ligands NOTA (1,4,7‐triazacyclononane‐ N , N ′, N ″triacetate), DOTA (1,4,7,10‐tetraazacyclo‐dodecane‐ N , N ′, N ″, N ″′‐tetraacetate), NOTP [1,4,7‐triazacyclononane‐ N , N ′, N ″‐tris(methylenephosphonate)] and DOTP [1,4,7,10tetraazacyclododecane‐ N , N ′, N ″, N ‴‐tetrakis(methylenephosphonate)] were characterised in aqueous solution by electronic absorption spectrophotometry and electron paramagnetic resonance (EPR) spectroscopy. While two isomeric species were detected by EPR spectroscopy in frozen samples of the polycarboxylate complexes, only one complex form was found for the poly(methylenephosphonate) systems. The results obtained are in accordance with a six‐coordinate pattern for the metal centre, yielding tetragonally distorted complexes in solution, in agreement with previously reported studies on Cu II complexes, both in solution and in the solid state.