Patent ID: 7517512

Claim:
A method for separating a predetermined gas from a mixture of gases, said method comprising a step of contacting an organometallic complex with said mixture of gases, said complex being obtained by reacting a salt of a metallic cation with a compound having the following formula: (Δ)N—R 1 —SiO 1,5 , 9 SiO 2 in which R 1 represents a divalent radical derived from a saturated or unsaturated aliphatic hydrocarbon chain containing 1 to 30 carbon atoms, in which there are optionally inserted one or more structural links selected from an arylene group or —O—, —S—, —O—C(═O)—, —N(R 6 )—C(═O)—or —N(R 6 )— fragments, in which R 6 represents a hydrogen atom, an aliphatic hydrocarbon radical containing 1 to 6 carbon atoms, a benzyl radical or a phenethyl radical, said chain being unsubstituted or substituted by one or more radicals selected from halogen atoms, a hydroxy group, alkyl radicals containing 1 to 4 carbon atoms or benzyl or phenethyl radicals, and (Δ)N— represents the monovalent amine radical, derived from an organic compound comprising at least one —NH— group.