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Metal complexes of macrocyclic ligands. Part XXIII . Synthesis, properties, and structures of mononuclear complexes with 12‐ and 14‐membered tetraazamacrocycle‐ N , N ′, N ″, N ‴‐tetraacetic Acids
Author(s) -
Riesen Andreas,
Zehnder Margareta,
Kaden Thomas A.
Publication year - 1986
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19860690830
Subject(s) - chemistry , octahedron , octahedral molecular geometry , metal , crystallography , metal ions in aqueous solution , ion , coordination geometry , dota , stereochemistry , chelation , crystal structure , inorganic chemistry , molecule , hydrogen bond , organic chemistry
The two tetraazamacrocycle‐ N , N ′, N ″, N ‴‐tetraacetic acids H 4 dota and H 4 teta form with Ni 2+ , Cu 2+ , and Zn 2+ (M 2+ ) mononuclear complexes MLH 2 and M′[ML], M′ being an alkaline earth ion. The structures of Ni(H 2 dota) and Cu(H 2 dota) have been solved by X‐ray structure analysis. The metal ions are in a distorted octahedral geometry coordinated by four amino N‐atoms and two carboxylates. In the case of Cu 2+ , the distortions are more pronounced than for Ni 2+ indicating that the Jahn ‐ Teller effect is operating. Starting from these two structures, the coordination geometry of the other complexes is discussed using VIS and IR spectra.