Structure and volatility of copper complexes containing pyrazolyl-based ligands

Volatility studies, electrospray mass spectra and IR in vapour phase were c arried out for a series of Cu(I) and Cu(II) complexes containing anionic py razole-based ligands such as 4-acyl-5-pyrazolonates and poly(pyrazolyl)bora tes. The volatility has been related to structural features and molecular p arameters of the copper complexes. The crystal structures of [Cu(Q')(2)(bip y)]. (acetone)(1.5) (Q' = 1-phenyl-3-methyl-4-benzoyl-pyrazolon-5-ato, bipy = 2,2'-bipyridyl) and [Cu(Q(1'))(2)(phen)]. EtOH (Q(F) = 1-phenyl-3-methyl -4-trifluoroacetyl-pyrazolon-5-ato, phen = 1,10-phenanthroline), have been also determined. In these complexes the copper atom is in a tetragonally di storted octahedral arrangement of the four O-atoms of pyrazolones with N-2- donor ligand in equatorial position. Two sets of Cu-O distances, the longer being in axial positions, have been found. XRD data of films obtained from metal organic chemical vapour deposition MOCVD experiments on [Cu(poly(pyr azolyl)borate)(PR3)] complexes have also been reported. (C) 2001 Elsevier S cience B.V. All rights reserved.