Reduction of [Ti (salen) Cl2,][salen =NN′-ethylenebis(salicylideneiminate)] with zinc dust in tetrahydrofuran (thf) gives deep blue solutions from which dimeric [{Ti(salen)(thf)}2][ZnCl4] is obtained. The reduced paramagnetism (µeff 0.96 B.M., 293 K) of this complex suggests a strong electronic interaction between two metal centres. The same solution, when treated with pyridine (py), leads to the very air-sensitive [Ti(salen) Cl (py)]· thf whose magnetic moment (µeff. 1.79 B.M. at 293 K) corresponds to that expected for a d1 system. X-Ray analysis of this complex confirms the pseudo-octahedral co-ordination around titanium, with the salen unit in the equatorial plane and Cl and py trans to each other in the axial positions. The crystal structure has been solved by the heavy-atom technique and refined by anisotropic least-squares methods to a final R of 0.066. The crystals are monoclinic, space group P21/c. with a= 9.828(2), b= 19.508(5), c= 13.465(2)Å, β= 109.5(4)°, U= 2 440(2)Å3, and Z= 4.

Preparations and structures of NN'-ethylenebis(salicylideneiminato)-titanium(III) derivatives

PASQUALI, MARCO;MARCHETTI, FABIO;
1978-01-01

Abstract

Reduction of [Ti (salen) Cl2,][salen =NN′-ethylenebis(salicylideneiminate)] with zinc dust in tetrahydrofuran (thf) gives deep blue solutions from which dimeric [{Ti(salen)(thf)}2][ZnCl4] is obtained. The reduced paramagnetism (µeff 0.96 B.M., 293 K) of this complex suggests a strong electronic interaction between two metal centres. The same solution, when treated with pyridine (py), leads to the very air-sensitive [Ti(salen) Cl (py)]· thf whose magnetic moment (µeff. 1.79 B.M. at 293 K) corresponds to that expected for a d1 system. X-Ray analysis of this complex confirms the pseudo-octahedral co-ordination around titanium, with the salen unit in the equatorial plane and Cl and py trans to each other in the axial positions. The crystal structure has been solved by the heavy-atom technique and refined by anisotropic least-squares methods to a final R of 0.066. The crystals are monoclinic, space group P21/c. with a= 9.828(2), b= 19.508(5), c= 13.465(2)Å, β= 109.5(4)°, U= 2 440(2)Å3, and Z= 4.
Pasquali, Marco; Marchetti, Fabio; Landi, A; Floriani, C.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

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/11568/202644
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact