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Modular approach to tridentate N,O,N' ligands using pyrazolylborate chemistry.

Authors
  • Bieller, Susanne
  • Bolte, Michael
  • Lerner, Hans-Wolfram
  • Wagner, Matthias
Type
Published Article
Journal
Chemistry (Weinheim an der Bergstrasse, Germany)
Publication Date
Jun 14, 2006
Volume
12
Issue
18
Pages
4735–4742
Identifiers
PMID: 16710866
Source
Medline
License
Unknown

Abstract

Two anionic tridentate N,O,N' chelators, [pz(Ph)B(mu-pz)(mu-O)B(Ph)pz](-) (3(-)) and [pz(Ph)(Ph)B(mu-pz)(mu-O)B(Ph)pz(Ph)](-) (4(-)), as well as the corresponding complexes [Fe(3)(py)Cl], [Fe(3)Cl(2)] and [Cu(3)Cl], have been synthesised and structurally characterised by X-ray crystallography (pz: pyrazolyl, pz(Ph): 3-phenylpyrazolyl, py: pyridine). Since our synthesis approach takes advantage of the highly modular pyrazolylborate chemistry, inexpensive and relatively resistant N,O,N' ligands of varying steric demand are readily accessible. The complexes [Fe(3)(py)Cl] and [Fe(3)Cl(2)] possess a distorted trigonal-bipyramidal configuration with the pyrazolyl rings occupying equatorial positions and the oxygen donor being located at an apical position. The complex [Cu(3)Cl] crystallises as chloro-bridged dimers featuring Cu(II) ions with ligand environments that are intermediate between a square-planar and a trigonal-bipyramidal geometry.

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