Site-specifically deuterated PSPCs. (a) Structures of site-specifically deuterated PSPC and SSM. Each numbered position was deuterium labeled. C-18′ was trideuterated and the other positions were dideuterated. (b) Synthesis of PSPCs deuterated at sn-2 chain. A total of 10 types of deuterium-labeled PSPCs (2′-d2-, 3′-d2-, 4′-d2-, 6′-d2-, 8′-d2-, 10′-d2-, 12′-d2-, 14′-d2-, 16′-d2-, and 18′-d3-PSPCs) were synthesized to capture the motion of PSPC in bilayers. MNBA: 2-methyl-6-nitrobenzoic anhydride, DMAP: N,N-dimethyl-4-aminopyridine. To see this figure in color, go online.