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Transition Metal Ion Complexes of 2,2′‐Bipyridyl‐3,3′‐diol and 2,2′‐Bipyridyl‐3‐ol: Spectroscopic Properties and Solvent‐Dependent Binding Modes
Author(s) -
Rurack Knut,
Radeglia Reiner
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 - 10.1002/1099-0682(200010)2000:10<2271::aid-ejic2271>3.0.co;2-3
Subject(s) - chemistry , acetonitrile , chelation , aqueous solution , solvent , metal ions in aqueous solution , hydrogen bond , transition metal , inorganic chemistry , metal , solvent effects , photochemistry , medicinal chemistry , polymer chemistry , molecule , organic chemistry , catalysis
The complexation behaviour of 2,2′‐bipyridyl‐3,3′‐diol and 2,2′‐bipyridyl‐3‐ol, BP(OH) 2 and BPOH, with various heavy and transition metal ions has been investigated in aqueous, alcoholic, and acetonitrile solutions. Whereas the complexes with paramagnetic ions and Hg II are non‐fluorescent, Zn II and Cd II form highly fluorescent complexes, their coordination geometries depending on the solvent proticity and hydrogen‐bond donating ability. Through a comparative study with the corresponding chelates of 2,2′‐bipyridyl (bipy), N , O ‐coordination in a six‐membered ring chelate has been found to be the dominant binding mode in both the Zn II and Cd II complexes in the protic solvents water and ethanol. Only for Zn II and BPOH is exclusive N , N′ ‐chelation found in acetonitrile. NMR measurements on BP(OH) 2 , BPOH, and bipy in the presence of Zn II and Cd II in acetonitrile confirmed these findings.