Synthesis and characterization of niobium(V) and tantalum(V) complexes with neutral schiff bases as ligands

✍ Scribed by K. Yamanouchi; S. Yamada

• Publisher: Elsevier Science
• Year: 1976
• Tongue: English
• Weight: 689 KB
• Volume: 18
• Category: Article
• ISSN: 0020-1693
• DOI: 10.1016/s0020-1693(00)95604-4

✦ Synopsis

The reactions of niobium and tantalum pentachlorides and oxotrichlorobis(triphenylphosphine oxide)niobium(V) with N-arylsalicylaldimines, abbreviated as (Sal-R)H, have yielded new niobium(V) and tantalum(V) complexes of the following three types: (1) MCl,(OR'),[(Sal-R)H];

(

2){M(NCS),(OC,H,) 2[(Sal-R) H]}zO; (3) NbOCl,[(Sal-R)H], (M = Nb, Ta; R' = CH3, C2H5). They are light-yellow to yelloworange, air-stable crystalline materials and are decomposed rapidly in solutions. On the basis of physical measurements, it is postulated that these complexes assume a six-coordinate structure involving the neutral Schiff base, which is coordinated as a unidentate ligand through an oxygen atom. Possible structures of these complexes are discussed mainly on the basis of pmr and infrared spectra.