title: Synthetic, spectroscopic, and structural studies on organoimido molybdenum, tungsten, and rhenium phthalocyanines.
abstract: Unprecedented imido phthalocyaninato complexes of pentavalent refractory metals [PcM(NR)Cl] (M = Mo, W, Re; R = tBu: 1, 3, 6, Mes: 2, 4, 7 or Ts: 5) have been synthesized by reductive cyclotetramerization of phthalonitrile in the presence of appropriate bis(imido) complexes of Mo, W and Re as templates. While d(1) Mo(V) and W(V) species 1-5 show distinctive EPR spectra corresponding to metal centered radicals with hyperfine coupling of two magnetically non-equivalent nitrogen atoms (4 equatorial and 1 axial N), corresponding d(2) Re(V) compounds 6 and 7 are diamagnetic. [PcMo(NtBu)Cl] 1 crystallizes from 1-chloronaphthalene in the tetragonal space group P4/n. The molecular structure reveals, that the metal center is located above the plane of the equatorial N4 and displaced towards the axial π-donor ligand. Due to the thermodynamic trans effect the Mo-Cl bond trans to the imido group is elongated to about 2.600(2) Å.
authors.affiliation: Philipps-Universität Marburg, Fachbereich Chemie, Hans-Meerwein Straße, 35043, Marburg.
authors.forename: Wael
authors.initials: W
authors.lastname: Darwish
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Seikel
authors.forename: Klaus
authors.initials: K
authors.lastname: Harms
authors.forename: Olaf
authors.initials: O
authors.lastname: Burghaus
authors.forename: Jörg
authors.initials: J
authors.lastname: Sundermeyer