Octahedral [Pd6L8]12+ Metallosupramolecular Cages: Synthesis, Structures and Guest‐Encapsulation Studies

摘要: Four planar tripyridyl ligands (Ltripy), 1,3,5-tris(pyridin-3-ylethynyl)benzene 1 a, 1,3,5-tris[4-(3-pyridyl)phenyl]benzene 2 a, and the hexyloxy chain functionalized derivatives 1,3,5-tris[(3-hexyloxy-5-pyridyl)ethynyl]benzene 1 b, 1,3,5-tris[4-(3-hexyloxy-5-pyridyl)phenyl]benzene 2 b, were synthesized used to generate a family of [Pd6(Ltripy)8](BF4)12 octahedral cages (Ltripy=1 a, b or 2 a, b). The characterized using combination 1H, 13C, DOSY nuclear magnetic resonance (NMR) spectroscopy, high resolution electrospray mass spectrometry (HR-ESI-MS), infrared (IR) elemental analysis, in three cases, X-ray crystallography. molecular recognition properties with neutral anionic guests examined, dimethyl sulfoxide (DMSO), NMR modeling. No binding was observed simple aliphatic aromatic guest molecules. However, sulfonates found interact interaction size selective. smaller [Pd6(1 a, b)8]12+ able p-toluenesulfonate molecules while larger [Pd6(2 a, b)8]12+ systems could host four To probe importance hydrophobic effect, mixed water–DMSO (1:1) solvent system reexamine organic adamantane, anthracene, pyrene 1,8-naphthalimide within cages. In this all except adamantane bind cavities spectroscopy modeling indicated that multiple copies individual (between 3–6 per cage).