Disclosed are compounds having the following formula: wherein R is an alkane chain having 8 and 20 carbon atoms, and A is one or more anions having a total charge of -2; or R is a quaternary amine having the following formula: wherein Ra and Rb are each an alkane chain having 8 and 20 carbon atoms, and A is one or more anions having a total charge of -3.在此揭示具有下式之化合物: 其中R是具有8至20個碳原子之烷烴鏈,且A是一或多個陰離子,其具有總電荷為-2;或R是具有下式之季胺: 其中Ra及Rb各為具有8至20個碳原子之烷烴鏈,且A是一或多個陰離子,其具有總電荷為-3。