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The counter anion effect of (16‐ethyl‐5,6,7,8‐tetrahydro‐9 H ‐dibenzo‐[ b, i ][1,4,8,11]tetraazacyclotetradecinato)nickel(II) complexes
Author(s) -
Hashimoto Mamoru,
Sakata Kazunori
Publication year - 1994
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570310238
Subject(s) - chemistry , nitromethane , nickel , acetonitrile , ion , conductance , medicinal chemistry , metal , metal ions in aqueous solution , inorganic chemistry , nuclear chemistry , organic chemistry , mathematics , combinatorics
The eight nickel(II) complexes with 16‐ethyl‐5,6,7,8,9,14‐hexahydrodibenzo[ b, i ][1,4,8,11]tetraazacyclotetradecine and a counter anion have been synthesized and their spectroscopic properties were studied. The δ N‐H values of NiLCl and NiLBr are observed in a more downfield range than those of NiLPF 6 , NiLBF 4 and NiLClO 4 in acetonitrile and nitromethane solutions. The plot of δ N‐H against molar conductance is found to be approximately linear. The N‐H stretching modes of NiLBF 4 , NiLPF 6 and NiLClO 4 shift to lower frequency and those of NiLCl, NiLBr and NiLI shift to higher frequency upon metal‐coordination.