Ionic liquid containing phosphonium ion and method for producing the same

An ionic liquid comprising a cation component and an anion component, the cation component being one or plural kinds selected from the group consisting of cation components represented by the following formula (1):

• wherein substitution groups R1 to R9 may be independently the same or different from one another;
• each of the substitution groups R1 to R9 is a hydrogen atom, a straight chain or branched chain alkyl group having 1 to 30 carbon atoms, a straight chain or branched chain alkenyl group having 2 to 30 carbon atoms with one or plural double bonds, a straight chain or branched chain alkynyl group having 2 to 30 carbon atoms with one or plural triple bonds, a saturated or a partially or fully unsaturated cycloalkyl group, an aryl group, or a heterocyclic group;
• any hydrogen atoms contained in one or a plurality of the substitution groups R1 to R9 may be partially or fully substituted by a halogen atom, or partially substituted by a CN group or a NO2 group;
• any one of the substitution groups R1 to R9 may form a ring structure together with one another;
• any carbon atoms contained in the substitution groups R1 to R9 may be substituted by an atom and/or an atomic group selected from the group consisting of —O—, —C(O)—, —C(O)O—, —S—, —S(O)—, —SO2—, —SO3—, —N═, —N═N—, —NH—, —NR′—, —N(R′)2, —PR′—, —P(O)R′—, —P(O)R′—O—, —O—P(O)R′—O— and —P(R′)2═N—, wherein R′ is a straight chain or branched chain alkyl group having 1 to 10 carbon atoms, an alkyl group partially or fully substituted by a fluorine atom, a saturated or a partially or fully unsaturated cycloalkyl group, a non-substituted or substituted phenyl group, or a non-substituted or substituted heterocyclic group;
• X represents a sulfur atom, an oxygen atom or a carbon atom;
• R8 and R9 exist only when X is a carbon atom;
• when X is a carbon atom, X, R1, R8 and R9 may form a saturated or a partially or fully unsaturated ring structure together with one another;
• and a dashed line represents a conjugated structure.

A method for producing an ionic liquid comprising alkylating an organic substance represented by the following general formula (2),

• the ionic liquid containing an organic substance represented by the general formula (1) as a cation component,
• wherein substitution groups R1 to R9 may be independently the same or different from one another;
• each of the substitution groups R1 to R9 is a hydrogen atom, a halogen atom, a straight chain or branched chain alkyl group having 1 to 30 carbon atoms, a straight chain or branched chain alkenyl group having 2 to 30 carbon atoms with one or plural double bonds, a straight chain or branched chain alkynyl group having 2 to 30 carbon atoms with one or plural triple bonds, a saturated or a partially or fully unsaturated cycloalkyl group, an aryl group, or a heterocyclic group;
• any hydrogen atoms contained in one or a plurality of the substitution groups R1 to R9 may be partially or fully substituted by a halogen atom, or partially substituted by a CN group or a NO2 group;
• any one of the substitution groups R1 to R9 may form a ring structure together with one another;
• any carbon atoms contained in the substitution groups R1 to R9 may be substituted by an atom and/or an atomic group selected from the group consisting of —O—, —C(O)—, —C(O)O—, —S—, —S(O)—, —SO2—, —SO3—, —N═, —N═N—, —NH—, —NR′—, —N(R′)2, —PR′—, —P(O)R′—, —P(O)R′—O—, —O—P(O)R′—O— and —P(R′)2═N—, wherein R′ is a straight chain or branched chain alkyl group having 1 to 10 carbon atoms, an alkyl group partially or fully substituted by a fluorine atom, a saturated or a partially or fully unsaturated cycloalkyl group, a non-substituted or substituted phenyl group, or a non-substituted or substituted heterocyclic group;
• X represents a sulfur atom, an oxygen atom or a carbon atom;
• R8 and R9 exist only when X is a carbon atom;
• and when X is a carbon atom, X, R1, R8 and R9 may form a saturated or a partially or fully unsaturated ring structure together with one another.