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A Versatile Approach to the Intramolecular Organization of Two Bipyridine‐Like Chelating Units in a Polytopic Ligand
Author(s) -
Kovbasyuk Larissa,
Hoppe Markus,
Pritzkow Hans,
Krämer Roland
Publication year - 2001
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 - 10.1002/1099-0682(200105)2001:5<1353::aid-ejic1353>3.0.co;2-c
Subject(s) - chemistry , phosphodiester bond , intramolecular force , chelation , ligand (biochemistry) , covalent bond , bipyridine , catalysis , organometallic chemistry , stereochemistry , copper , pyrimidine , polymer chemistry , medicinal chemistry , combinatorial chemistry , crystallography , crystal structure , organic chemistry , receptor , rna , biochemistry , gene
The synthesis of four novel polypyridyl ligands, in which two 4,6‐[bis(2‐pyridyl)]pyrimidine units are covalently linked by spacer groups −S− ( 1 ), −S−S− ( 2 ), −Se− ( 7 ), and −Se−Se− ( 6 ), is reported. A new unsymmetrical dinucleating ligand 4 was isolated as a by‐product in the synthesis of 2 and has been characterized by X‐ray crystallography. Copper(II) complexes [( 1 )Cu](NO 3 ) 2 ·5H 2 O and [( 7 )Cu](ClO 4 ) 2 ·6H 2 O have been isolated, spectroscopic data for which are consistent with tetradentate N 4 coordination by the ligands. In situ prepared polynuclear copper(II) complexes of 1 and 7 show different catalytic activities in the cleavage of the phosphodiester 2‐hydroxypropyl p ‐nitrophenyl phosphate. This might be a consequence of the influence of the covalent spacer (S or Se) on the preorganization of two bipyridine‐like chelating units in [LCu] 2+ , which bind two catalytic Cu 2+ ions.