The liposome of claim 22 wherein the carboranes are selected from the group consisting of: and wherein X is selected from the group consisting of alkali metals and tetra alkyl ammonium, and R is a lipophlic alkyl group; and wherein R is a lipophilic alkyl group; and wherein R1 and R2 are the same or different and are a lipophilic alkyl group, or R1 or R2 is H and the other of R1 or R2 is a lipophi