Study of cloverite molecular sieves modified by grafting organometallic complexes inside the pores: I. Synthesis and characterization of cloverite modified by grafting –SnR3 fragments (R=Me, Et, n-Bu, Cy)

✍ Scribed by M. Adachi; J. Corker; H. Kessler; F. Lefebvre; J.M. Basset

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 285 KB
• Volume: 21
• Category: Article
• ISSN: 1387-1811
• DOI: 10.1016/s1387-1811(97)00053-x

✦ Synopsis

The reaction of various alkyltin compounds [HSnBu 3 and SnR 4 , R=Me, Et, cyclohexyl (Cy)] with cloverite dehydroxylated at 450°C was studied by various methods such as 1H, 31P and 119Sn MAS NMR, 13C CP-MAS NMR, infrared spectroscopy, analysis of evolved gases, thermolysis and chemical analysis. All techniques showed that there was a formation of grafted -SnR 3 fragments. However, depending on the size of the organometallic fragment, the grafting reaction did not occur in the same manner: while -SnR 3 (R=Me, Et, n-Bu) fragments were grafted homogeneously over the entire crystal volume, -SnCy 3 fragments were grafted only on the external surface, as previously observed on mordenite. In addition, depending on the size of the R alkyl group, different grafted complex loadings were achieved: for R=Me, up to four -SnMe 3 could be grafted per window aperture, while for R=Et and n-Bu, only one complex could be grafted per window aperture.