The　self-assembly　of　(tmen)Pd(NO3)(2)　(where　tmen　=　N-1,　N-1,　N-2,　tetramethylethane-1,2-diamine)　and　4,7-phenanthroline　rigid　ligand　(L)　in　aqueous　solution　affords　positively　charged　[Pd3L3](6+)　Pd-based　molecular　bowls　(1a.6NO(3)(-)　and　1b.68F(4)(-)).　Their　structures　were　characterized　by　H-1　NMR,　electrospray　ionization　mass　spectrometry　and　single-crystal　X-ray　diffraction　analysis.　Interestingly,　X-ray　diffraction　analysis　of　1a.6NO(3)(-)　and　1b.68F(4)(-)　revealed　that　an　anion　was　bound　inside　the　cavity　of　the　bowl-shaped　structure　by　multiple　C-H　center　dot　center　dot　center　dot　O　hydrogen　bonds　in　1a.6NO(3)(-),　while　multiple　C-H　center　dot　center　dot　center　dot　F　hydrogen　bonds　in　1b.6BF(4)(-).　The　interactions　between　[Pd3L3](6+)　molecular　bowl　and　a　variety　of　anions　were　investigated　via　NMR　titration　and　fluorescent　studies,　respectively.　(C)　2017　Elsevier　B.V.　All　rights　reserved.