A series of di- and monosubstituted cis-platinum(II) silanolate complexes, Pt(OSiR3)2(dppe) (R=Et, 1; R=Me, 2) and Pt(OSiR3)Cl(dppe) (R=Et, 3; R=iPr, 4) where dppe is 1,2-bis(diphenylphosphino)ethane, have been isolated and characterised spectroscopically. Complex 1 does not react with CO and H2 under anhydrous conditions, but the complexes Pt{C(O)OCH3)}2(dppe) (6) and Pt(CO3)(dppe) (7) have been isolated bubbling CO in methanol and CO2 in moist benzene solutions of 1, respectively. The behaviour of 1 towards water or methanol is discussed on the basis of 1H, and 31P{1H} NMR spectroscopic data. The new complex Pt{S2C(OSiEt3)2}(dppe) (8) has been isolated by reaction of 1 with CS2 in benzene solution. This reactivity would suggest a high sensitivity towards water, but not towards H2 or CO, of the bonding of slightly oxidised platinum particles with silanol groups of silica surface.
Synthesis and reactivity of diphosphino Pt(II) silanolate complexes as molecular models of the interaction of platinum particles with silica / G. Banditelli, M. Pizzotti, A. L. Bandini, C. Zucchi. - In: INORGANICA CHIMICA ACTA. - ISSN 0020-1693. - 330:1(2002), pp. 72-81. [10.1016/S0020-1693(01)00767-8]
Synthesis and reactivity of diphosphino Pt(II) silanolate complexes as molecular models of the interaction of platinum particles with silica
G. BanditelliPrimo
;M. PizzottiSecondo
;A.L. BandiniPenultimo
;
2002
Abstract
A series of di- and monosubstituted cis-platinum(II) silanolate complexes, Pt(OSiR3)2(dppe) (R=Et, 1; R=Me, 2) and Pt(OSiR3)Cl(dppe) (R=Et, 3; R=iPr, 4) where dppe is 1,2-bis(diphenylphosphino)ethane, have been isolated and characterised spectroscopically. Complex 1 does not react with CO and H2 under anhydrous conditions, but the complexes Pt{C(O)OCH3)}2(dppe) (6) and Pt(CO3)(dppe) (7) have been isolated bubbling CO in methanol and CO2 in moist benzene solutions of 1, respectively. The behaviour of 1 towards water or methanol is discussed on the basis of 1H, and 31P{1H} NMR spectroscopic data. The new complex Pt{S2C(OSiEt3)2}(dppe) (8) has been isolated by reaction of 1 with CS2 in benzene solution. This reactivity would suggest a high sensitivity towards water, but not towards H2 or CO, of the bonding of slightly oxidised platinum particles with silanol groups of silica surface.Pubblicazioni consigliate
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