The reactions of quinquedentate Schiff-base ligands derived from salicylaldehyde and diethylenetriamine (H3L1) or 3,3?-diamino-N-methyldipropylamine (H2L2) with [MO(eg)2]- (M = Tc or Re; H2eg = ethylene glycol) have been investigated. The complexes [MOL1] and [MOL2]+ were produced and characterized by the usual physicochemical measurements. In particular the crystal structure of [TcOL1] was determined by single-crystal X-ray diffraction methods. Crystals are monoclinic, space group P21/c, with a = 9.459(8), b = 9.437(7), c = 21.768(12) Å, ? = 99.08(5)°, and Z = 4. X-Ray diffraction provided 2 097 observed reflections (up to 2? = 50°) and the structure has been refined by full-matrix least-squares methods to R = 0.053. The compound consists of discrete TcOL1 molecules with one methanol methanol molecule of crystallization also present in the crystal lattice. One of the oxygen atoms of the quinquedentate ligand is located trans to the technetium-oxo bond, while the remaining four donor atoms occupy the equatorial sites around the Tc atom which resides in a highly distorted octahedral co-ordination environment. The distance between the deprotonated N atom and Tc [1.894(8) Å] is significantly shorter than the average for Tc-N single bond lengths.

Technetium(V) and rhenium(V) complexes with Schiff-base ligands containing the ONNNO donor atom set. Crystal structure of [N,N?-3-azapentane-1,5-diylbis(salicylideneiminato)(3-)-O,O',N, N',N'']-oxotechnetium(V)

Refosco F;Tisato F;
1988

Abstract

The reactions of quinquedentate Schiff-base ligands derived from salicylaldehyde and diethylenetriamine (H3L1) or 3,3?-diamino-N-methyldipropylamine (H2L2) with [MO(eg)2]- (M = Tc or Re; H2eg = ethylene glycol) have been investigated. The complexes [MOL1] and [MOL2]+ were produced and characterized by the usual physicochemical measurements. In particular the crystal structure of [TcOL1] was determined by single-crystal X-ray diffraction methods. Crystals are monoclinic, space group P21/c, with a = 9.459(8), b = 9.437(7), c = 21.768(12) Å, ? = 99.08(5)°, and Z = 4. X-Ray diffraction provided 2 097 observed reflections (up to 2? = 50°) and the structure has been refined by full-matrix least-squares methods to R = 0.053. The compound consists of discrete TcOL1 molecules with one methanol methanol molecule of crystallization also present in the crystal lattice. One of the oxygen atoms of the quinquedentate ligand is located trans to the technetium-oxo bond, while the remaining four donor atoms occupy the equatorial sites around the Tc atom which resides in a highly distorted octahedral co-ordination environment. The distance between the deprotonated N atom and Tc [1.894(8) Å] is significantly shorter than the average for Tc-N single bond lengths.
1988
CHIMICA INORGANICA E DELLE SUPERFICI
Istituto di Chimica della Materia Condensata e di Tecnologie per l'Energia - ICMATE
File in questo prodotto:
File Dimensione Formato  
prod_225660-doc_54951.pdf

solo utenti autorizzati

Descrizione: Technetium(V) and rhenium(V) complexes with Schiff-base ligands containing the ONNNO donor atom set
Dimensione 652.59 kB
Formato Adobe PDF
652.59 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/115996
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 34
  • ???jsp.display-item.citation.isi??? ND
social impact