| Abstract: | The three secondary phosphine oxides CH2=CH(CH2)4]2HPO ( 1 ), CH2=CH(CH2)5]2HPO ( 2 ), and CH2=CH(CH2)6]2HPO ( 3 ), and two diphosphine dioxides, {CH2=CH(CH2)6]2PO(CH2)7}2 ( 4 ) and {CH2=CH(CH2)6]2PO(CH2)4}2 ( 5 ), incorporating long methylene chains, are described. The single crystal X‐ray structures of 1 , 2 , and 5 have been determined. The phosphine oxides 3 , 4 , and 5 have been adsorbed on silica in submonolayer quantities to give 3 a – 5 a . The 1H, 13C, and 31P solid‐state NMR spectra of polycrystalline 3 – 5 have been analyzed and compared with those of 3 a – 5 a . The changes of the solid‐state NMR characteristics upon adsorption and the surface mobilities of the phosphine oxides are discussed. |
