LIGAND EFFECT ON THE STRUCTURES AND ACIDITIES OF [TPOS(H-2)(PPH3)(2)]BF4 AND [CPOSH2(PR3)(2)]BF4

Authors
NG WS JIA GC HUANG MY LAU CP WONG KY WEN LB
Citation
Ws. Ng et al., LIGAND EFFECT ON THE STRUCTURES AND ACIDITIES OF [TPOS(H-2)(PPH3)(2)]BF4 AND [CPOSH2(PR3)(2)]BF4, Organometallics, 17(21), 1998, pp. 4556-4561
Citations number
61
Categorie Soggetti
Chemistry Inorganic & Nuclear","Chemistry Inorganic & Nuclear
Journal title
Organometallics → ACNP
ISSN journal
02767333
Volume
17
Issue
21
Year of publication
1998
Pages
4556 - 4561
Database
ISI
SICI code
0276-7333(1998)17:21<4556:LEOTSA>2.0.ZU;2-K
Abstract
The new molecular dihydrogen complex [TpOs(H-2)(PPh3)(2)]BF4 was prepa red by protonation of TpOsH(PPh3)(2) with HBF4. The pseudo-aqueous pK( a) values of [CpOsH2(PR3)(2))]BF4 ((PR3)(2) = (PPh3)(2), dppm, dppe, d ppp) and [TpOs(H-2)(PPh3)(2)]BF4 have been determined in dichlorometha ne. [TpOs(H-2)(PPh3)(2)]BF4 was found to be more acidic than trans-[Cp OsH2(PPh3)(2)]BF4. While [TpOs(H-2)(PPh3)(2)]BF4 is less acidic than [ TpRu(H-2)(PPh3)(2)]BF4 by 1.3 pK(a) units, trans-[CpOsH2(PPh3)(2)]BF4 is less acidic than trans-[CpRuH2(PPh3)(2)]BF4 by 5.1 pK(a) units.