Abstract
Treatment of CuX2 (X- = Cl-, Br-) with one molar equivalent of K[HB{pzPh}3] (pzPhH = 3-phenylpyrazole) in CH2Cl2: MeCN (4: 1) at room temperature afforded [CuX(pzPhH)(HB{pzPh}3)] (X = Cl , I; X- = Br-, II) in moderate to good yields. The crystal structure of the title compound shows a square-pyramidal copper(II) centre, with Cu - Cl = 2.2740(13) Å and Cu - N = 2.010(3), 2.031(3), 2.038(3), 2.241(3) Å. The complex exhibits an intramolecular N - H ⋯ Cl hydrogen bond, with N - H ⋯ Cl = 3.034(4) Å, N - H ⋯ Cl = 119.4°, and an intramolecular graphitic interaction between the pzPhH pyrazole ring and a phenyl group from the tripodal ligand. Steric repulsions between this phenyl group and the bound Cl- cause substantial distortions from an ideal square-pyramidal geometry. Reaction of K[HB{pzPh}3] with Cu2(O2CMe)4 · 2H2O yields [Cu(O2CMe)(HB{pzPh}3)] (III). The EPR and UV-vis spectroscopic properties of I-III are consistent with a {dx2-y2}1 configuration at copper.
Original language | English |
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Pages (from-to) | 1535-1541 |
Number of pages | 7 |
Journal | Polyhedron |
Volume | 16 |
Issue number | 9 |
DOIs | |
Publication status | Published - 31 Dec 1997 |
Bibliographical note
Funding Information:for a University Research Fellowship to M.A.H., the E.P.S.R.C. for purchase of a diffractometer, the University of Cambridge and St Catharine's College for support. We also thank Dr G. Reid (University of Southampton) for the EPR spectrum of II.
Funding
for a University Research Fellowship to M.A.H., the E.P.S.R.C. for purchase of a diffractometer, the University of Cambridge and St Catharine's College for support. We also thank Dr G. Reid (University of Southampton) for the EPR spectrum of II.
Keywords
- B - N cleavage
- Copper
- Crystal structure
- Tris-pyrazolylborate
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry