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Ligand Synthesis and Metal Complex Formation of 1,2,3‐Triaminopropane
Author(s) -
Zimmer Anja,
Müller Iris,
Reiß Guido J.,
Caneschi Andrea,
Gatteschi Dante,
Hegetschweiler Kaspar
Publication year - 1998
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(199812)1998:12<2079::aid-ejic2079>3.0.co;2-b
Subject(s) - chemistry , protonation , aqueous solution , crystal structure , crystallography , potentiometric titration , ligand (biochemistry) , adduct , stereochemistry , metal , amine gas treating , inorganic chemistry , organic chemistry , ion , biochemistry , receptor
A series of linear primary polyamines H 2 N–CH 2 –(CH–NH 2 ) n –CH 2 –NH 2 (1 ≤ n ≤ 3) was prepared from the corresponding polyalcohols. The polyamines were isolated as HCl adducts and the acidity constants in aqueous solution were determined. The crystal structure of the fully protonated tetraamine ( n = 2) was elucidated by an X‐ray diffraction study. Complex formation of the triamine ( n = 1) with Ni 2+ , Cu 2+ , Zn 2+ , Cd 2+ was re‐investigated in aqueous solution. The pH‐dependent formation of a variety of species M x L y H z was established by potentiometric titrations and was compared with previous reports. The crystal structure of the Cu complex [CuL 2 ]Cl 2 exhibited a chain structure with a five‐coordinate Cu II centre in which two amino groups of the triamine ligands are coordinated to one Cu centre, while the third amino group of one of the ligands is bonded to a neighbouring Cu atom. The compound shows weak antiferromagnetic coupling interactions between the Cu II centres within the chain.