English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/52305
Título

A square-pyramidal organochromium(V) compound

AutorGarcía-Monforte, M. Ángeles ; Alonso, Pablo J.; Arauzo, Ana B.; Martín, Antonio ; Menjón, Babil ; Rillo, Conrado
Fecha de publicación2012
EditorRoyal Society of Chemistry (Great Britain)
CitaciónDalton Transactions 41(4): 1297-1303 (2012)
ResumenThe mononuclear, five-coordinate organochromium(v) compound [NBu 4][CrO(C 6F 5) 4] (1) has been obtained as a dark red solid in moderate yield by treatment of the homoleptic organochromium(iii) derivative [NBu 4] 2[Cr(C 6F 5) 5] with NO[BF 4] in CH 2Cl 2 solution under an oxygen atmosphere. The Cr V centre in the [CrO(C 6F 5) 4] - anion shows a square-pyramidal geometry with the four C 6F 5 groups in the basal positions and the oxo ligand in the apical one (X-ray). The short Cr-O distance (153.8(2) pm) suggests a high degree of triple bond character for the chromyl unit. The EPR spectrum of 1 in solution shows an isotropic signal with g iso = 1.995(1) and a rich hyperfine structure due to coupling with the 53Cr isotope [a Cr = 46.95(4) MHz] as well as with the ortho-F and meta-F substituents of the C 6F 5 rings [a F = 4.20(2) MHz and a′ F = 2.12(2) MHz] in keeping with the presence of non-interacting, fast tumbling, paramagnetic [CrO(C 6F 5) 4] - units (d 1). In the solid state, however, both the microscopic (EPR) and macroscopic magnetic properties (isothermal magnetisation and thermal dependence of the magnetic susceptibility) suggest the existence of weak ferromagnetic interactions with T C = 0.20(2) K. Such magnetic interactions may probably be favoured by Ï€ interactions between C 6F 5 rings of neighbour [CrO(C 6F 5) 4] - units in the crystal. © 2012 The Royal Society of Chemistry.
URIhttp://hdl.handle.net/10261/52305
DOI10.1039/c1dt11376c
Identificadoresdoi: 10.1039/c1dt11376c
issn: 1477-9226
e-issn: 1477-9234
Aparece en las colecciones: (ISQCH) Artículos
(ICMA) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
accesoRestringido.pdf15,38 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 

Artículos relacionados:


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.