Cellulose-based poly(ionic liquid)s: Correlations between degree of substitution and alkyl side chain length with conductive and morphological properties.

Ion transport in solid polymer electrolytes is crucial for applications like energy conversion and storage, as well as carbon dioxide capture. However, most of the materials studied in this area are petroleum-based. Natural materials (biopolymers) have the potential to act as alternatives to petroleum-based products and, when derived with ionic liquid (IL) functionalities, present a sustainable alternative for conductive materials by offering tunable morphological, thermal, and mechanical properties.

The Unexpected Formation of 9,9,10,10-Tetrafluoro-1,2,4,12-tetraphenyl[2.2]paracyclophan-1-ene.

An investigation of the palladium-catalyzed Kumada cross-coupling reaction between PhMgBr and (pseudo-ortho) 4,12-diiodo-1,1,2,2,9,9,10,10-octafluoro[2.2]paracyclophane revealed that in addition to the expected cross-coupled product, an unintended major product was generated. The product was determined to be 9,9,10,10-tetrafluoro-1,2,4,12-tetraphenyl[2.

Discrimination of pseudo-meta and pseudo-para diamino-octafluoro[2.2]paracyclophanes by (1)H, (19)F, and (13)C NMR.

Pseudo-meta and pseudo-para diamino-octafluoro[2.2]paracyclophanes are challenging to separate either by chromatography or recrystallization, but through the use of a mixture of the two isomers, the (1)H, (19)F, and (13)C NMR spectra of these compounds have been fully and unambiguously assigned using (1)H COSY, (1)H-(19)F HOESY, (1)H-(13)C HSQC, (1)H-(13)C HMBC, and (19)F-(13)C HSQC techniques. This permits the easy identification of either of the individual isomers.

A self-assembled, metallo-organic supramolecular frequency doubler.

The dimeric self-assembly program of a new, multidentate ligand with cuprous ions overcomes crystal packing forces, which leads to C(i) symmetry in the solid state, to form a no less than partially C(2)-symmetric structure in solution. The resulting tetranitro-substituted dicopper(i) metallocyclophane displays an exceptionally strong second harmonic frequency response (β = (3000 ± 600) × 10(-30) esu for a fundamental at 800 nm).

Investigation of the correlations between (19)F and (1)H NMR signals for various mono- and di-substituted octafluoro[2.2]paracyclophanes.

A selection of mono- and pseudo ortho di-substituted octafluoro[2.2]paracyclophane derivatives were analyzed using (19)F-(1)H HOESY, (1)H COSY and (19)F COSY techniques. This resulted in the unambiguous assignment of the (19)F and (1)H NMR resonances, and also revealed interesting solvent effects and noteworthy coupling patterns for various J(HH), J(HF), and J(FF) interactions, including observable through bond (7)J(FF) and (8)J(FF) couplings.

Full multinuclear resonance analysis of 4-amino-1,1,2,2,9,9,10,10-octafluoro[2.2]paracyclophane.

The complete assignment of 19F, 1H and 13C NMR spectra for a monosubstituted octafluoro[2.2]paracyclophane derivative is described for the first time. The unambiguous assignments were achieved through the combination of 19F--1H HOESY, 1H COSY and 19F COSY techniques and then further confirmed employing a complementary approach using a Karplus-dependent 3JCF interaction.

An exploration of Suzuki aryl cross coupling chemistry involving [2.2]paracyclophane derivatives.

Suzuki aryl cross coupling reactions using derivatives of [2.2]paracyclophane were examined. A variety of aryl boronic acids and pinacolate esters were successfully cross coupled with 4-bromo[2.

Complete assignment of 19F, 1H and 13C NMR spectra of monomers and precursors towards bridge trifluoromethylated poly(p-phenylenevinylene).

The complete assignment of 19F, 1H and 13C NMR spectra of 11 trifluoromethylated and four bistrifluoromethylated monomers for bridge trifluoromethylated poly(p-phenylenevinylene) is described. The combination of one-dimensional 19F, 1H and 13C spectra, long-range fluorine couplings and the two-dimensional techniques of direct and long-range HETCOR (J = 140 and 8 Hz) permitted full resonance assignment.