Postsecondary Education Supports for Students with Disabilities: A Review and Response.

The aqueous self-assembly of the flexible ligand L bis(1H-benz[d]imidazole-1-yl)methane and cis-coordinated PtII precursors [(en)Pt²⁺ , (tmeda)Pt²⁺ , en=ethylenediamine, tmeda=N,N,N',N'-tetramethylethylenediamine)] led to the formation of the metallacalixarenes with full alternative conformations (e.g., two novel water-soluble metallacalixarenes [M₂ L₂ ]⁴⁺ and [M₃ L₃ ]⁶⁺ with D₂ and D₃ symmetry, respectively). Their molecular structures were determined by single crystal X-ray analyses in solid state. The two metallacalixarenes present different cavity sizes and the [M₃ L₃ ]⁶⁺ cavity encapsulates one NO₃ ⁻ . NOESY NMR revealed that the conformational interconversion between 1,3-alternate conformer in methanol and cone conformer in DMSO was tuned via the synergistic effect between solvent and anion. Guest encapsulation is also discussed.