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Wasserlösliche Metallkomplexe und Katalysatoren, V. 2,2′‐Bipyridin‐5‐sulfonsäure und metallorganische Komplexe: Spektroskopie und Strukturchemie
Author(s) -
Herrmann Wolfgang A.,
Thiel Werner R.,
Kuchler Josef G.,
Behm Joachim,
Herdtweck Eberhardt
Publication year - 1990
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19901231006
Subject(s) - chemistry , sulfonic acid , sulfonamide , pyridine , reactivity (psychology) , ligand (biochemistry) , polymer chemistry , chelation , medicinal chemistry , nuclear magnetic resonance spectroscopy , bipyridine , metal , catalysis , stereochemistry , crystal structure , crystallography , organic chemistry , receptor , pathology , medicine , biochemistry , alternative medicine
Water‐Soluble Metal Complexes and Catalysts, V. — 2,2′‐Bipyridine‐5‐sulfonic Acid and Organometallic Complexes: Spectroscopy and Structures Coplanar orientation of the pyridine rings in 2,2′‐bipyridine‐5‐sulfonic acid ( 1a ) and in metal complexes of this ligand is evident from NMR studies. While the free acid 1a exists as a planar zwitter‐ion the rings of the salts 1b–d (Na + , [N(C 4 H 9 ) 4 ] + ,[P(C 6 H 5 ) 4 )] + ) and sulfonamides 1f–h ( tert ‐butyl, benzyl, 2‐pyridylmethyl) are twisted. X‐ray crystal structures determined for four complexes 4e, h, 1 , and 10b of the sulfonic acid and sulfonamide derivatives of 2,2′‐bipyridine show that there is no influence of the sulfonic acid and the sulfonamide groups ( meta ‐position) on the complex chemistry of the chelate ligand. Variation of solubility should, therefore, occur without principal changes of reactivity.