《英文msh词典》Compounds,Onium
[入口词] Compounds,Onium
[主题词] Onium Compounds
[英文释义] Ions with the suffix -onium,indicating cations with coordination number 4 of the type RxA+ which are analogous to AMMONIUM COMPOUNDS (H4N+). Ions include phosphonium R4P+,oxonium R3O+,sulfonium R3S+,chloronium R2Cl+