Pt-Sn heterometallic system shows a good catalytic activity in hydrogenation, isomerisation and hydroformylation of olefins, both in homogeneous and heterogeneous phase. Pt-Sn carbonyl clusters could have a similar behaviour. So, we have focused our attention on the reactivity of the dianion [Pt15(CO)30]2- with Sn-based reagents, in order to obtain new Pt-Sn species. The first reported Pt-SnCl2 cluster was [Pt8(SnCl2)4(CO)10]2- [1], while recently we have prepared and characterized the series [Pt5(CO)5{Cl2Sn(μ-OR)SnCl2}3]3− (R = H, Me, Et, iPr; 1−4) [2]. Here we report the preparation and characterization of different heteroleptic Pt-Sn clusters, containing, besides carbon monoxide, SnCl2, SnCl3 or PPh3 as ligands. Generally [Pt15(CO)30]2- and SnCl2 (and eventually PPh3) are the starting materials; by changing the experimental conditions (cluster counter-ion, reaction solvent, Pt:Sn molar ratio) it is possible to selectively obtain different products. The parent [Pt6(SnCl2)2(SnCl3)4(CO)6]4- cluster has been used to prepare a new series of carbonyl clusters as summarized in the following reaction scheme. The new compounds have been structurally characterized by single crystal x-ray diffraction analysis.
El Afefey, S., Daghetta, M., Zacchini, S., Sironi, A., DELLA PERGOLA, R., Ceriotti, A., et al. (2012). A new family of Pt-Sn heteroleptic clusters. In Proceedings.
A new family of Pt-Sn heteroleptic clusters
SIRONI, ANNALISA;DELLA PERGOLA, ROBERTO;
2012
Abstract
Pt-Sn heterometallic system shows a good catalytic activity in hydrogenation, isomerisation and hydroformylation of olefins, both in homogeneous and heterogeneous phase. Pt-Sn carbonyl clusters could have a similar behaviour. So, we have focused our attention on the reactivity of the dianion [Pt15(CO)30]2- with Sn-based reagents, in order to obtain new Pt-Sn species. The first reported Pt-SnCl2 cluster was [Pt8(SnCl2)4(CO)10]2- [1], while recently we have prepared and characterized the series [Pt5(CO)5{Cl2Sn(μ-OR)SnCl2}3]3− (R = H, Me, Et, iPr; 1−4) [2]. Here we report the preparation and characterization of different heteroleptic Pt-Sn clusters, containing, besides carbon monoxide, SnCl2, SnCl3 or PPh3 as ligands. Generally [Pt15(CO)30]2- and SnCl2 (and eventually PPh3) are the starting materials; by changing the experimental conditions (cluster counter-ion, reaction solvent, Pt:Sn molar ratio) it is possible to selectively obtain different products. The parent [Pt6(SnCl2)2(SnCl3)4(CO)6]4- cluster has been used to prepare a new series of carbonyl clusters as summarized in the following reaction scheme. The new compounds have been structurally characterized by single crystal x-ray diffraction analysis.
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