Unusual changes in hyperfine coupling constants observed for copper(II) complexes with N,N-bis(benzimidazol-2-ylmethyl)amine and its homologues; X-ray crystal structure determinations of [CuLPri(NO3)(MeOH)]NO3, [cuLBut(NO3)(MeOH)]NO3, [cuLBun(NO3)]NO3, and ...

Yuzo Nishida, Kazuhiro Takahashi

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42 Citations (Scopus)

Abstract

full title:Unusual changes in hyperfine coupling constants observed for copper(II) complexes with N,N-bis(benzimidazol-2-ylmethyl)amine and its homologues; X-ray crystal structure determinations of [CuLPri(NO3)(MeOH)]NO3, [cuLBut(NO3)(MeOH)]NO3, [cuLBun(NO3)]NO3, and [cuLBui(NO3)]NO3 Crystal structures of four copper(II) complexes, [CuLPri(NO3)(MeOH)]NO3 (5), [CuLBun(NO3)]NO3 (6), [CuLBui(NO3)]NO3 (7), and [CuLBut(NO3)(MeOH)]NO3 (9) were determined by X-ray diffraction methods, where LBun, LBut, LBui, and LPri respresent the n-butyl, t-butyl, isobutyl, and isopropyl derivative, on the amine nitrogen atom, of LH, N,N-bis(benzimidazol-2-ylmethyl)amine. These complexes consist of a mononuclear compound with a tridentate ligand (LH or its derivative) and a bidentate nitrate ion. These show quite similar absorption spectra in methanol solution. However, remarkable differences were observed for {|A| values in e.s.r. spectra (frozen methanol solution) irrespective of the small change in the g value. Bulky substituents, such as t-butyl, on the amine nitrogen atom decrease the |A| value considerably {|A| = 160 × 10-4 cm-1 for [CuLH(NO3)]+ and |A| = 110 × 10-4 cm-1 for [CuLBut(NO3)(MeOH)]+}, suggesting that the change of orientation of the lone pair orbital of the amine nitrogen atom produces a sizeable effect on |A| values in these complexes.

Original languageEnglish
Pages (from-to)691-699
Number of pages9
JournalJournal of the Chemical Society, Dalton Transactions
Issue number3
DOIs
Publication statusPublished - Dec 1 1988
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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