Our recently discovered, selective, on-resin route to N(τ)-alkylated imidazolium-containing histidine residues affords new strategies for peptide mimetic design. In this, we demonstrate the use of this chemistry to prepare a series of macrocyclic phosphopeptides, in which imidazolium groups serve as ring-forming junctions. Interestingly, these cationic moieties subsequently serve to charge-mask...

The electrochemical behavior of 1-ferrocenylmethyl-3-(methyl)-imidazolium iodide (or mesityl) imidazolium was studied by cyclic voltammetry at glassy carbon electrode in midiums organic to determine the influences electronic group on ferrocene. experimental results indicated that redox reaction reversible. Mass transport towards is a simple diffusion process and coefficient (D) for couple has b...

We studied the regulation of intracellular pH (pH i ) in single cultured astrocytes passaged once from the hippocampus of the rat, using the dye 2 9 ,7 9 -biscarboxyethyl-5,6-carboxyfluorescein (BCECF) to monitor pH i . Intrinsic buffering power ( b I ) was 10.5 mM (pH unit) 2 1 at pH i 7.0, and decreased linearly with pH i ; the best-fit line to the data had a slope of 2 10.0 mM (pH unit) 2 2 ...

When giant axons of squid, Sepioteuthis, were bathed in a 100 mM Ca-salt solution containing tetrodotoxin (TTX) and internally perfused with a solution of 100 mM tetraethylammonium-salt (TEA-salt) or tetramethylammonium-salt (TMA-salt), the membrane potential was found to become sensitive to anions, especially Cl-. Membrane currents recorded from those axons showed practically no time-dependent...

Water-soluble fluorescent probes, including 1-pyrene butyric acid, rhodamine B, sodium salt 1,5diaminoanthraquinone-2,6-disulfonic acid, quinine hemisulfate and monosodium salt 8-amino1-naphthol-3,6-disulfonic acid were used to determine the critical micelle concentration (cmc) of inverted micelles formed by cholic acid in tetrahydrofuran. Another water-insoluble fluorescent probe, namely pyren...

Abstract Tetranuclear hydroxo complexes [La 4 (Deta) (OH) (Tfa) 3 (DetadcH) 2 ](HTfa)(H O) 7 ( I ) and [Nd ](H n II with diethylene- N , ′-dicarbamate anions (DetadcH – are synthesized for the first time by reactions of lanthanum trifluoroacetate neodymium a solution diethylenetriamine in air under self-controlled hydrolysis conditions characterized X-ray diffraction, powder IR spectroscopy, el...

Polarity studies in two classes of imidazolium-based protic ionic liquids (PILs) possessing [HSO(4)](-), [HCOO](-), [CH(3)COO](-) and [CH(3)CH(2)COO](-) anions were carried out using a solvatochromic method from 298.15 to 353.15 K. For 1-methylimidazolium class of PILs, E(T)(30) was found to be independent over the entire range of temperature, while E(T)(30) was noted to decrease with a rise in...

In the title compound, C(10)H(16)N(4) (2+)·2NO(3) (-), the organic cation is located around an inversion centre. The imidazolium ring forms a dihedral angle of 62.7 (3)° with the plane defined by the C atoms of the -(CH(2))(4)- aliphatic linker. Two anions bind to the cation via three-centre N-H⋯O hydrogen bonds and thus discrete hydrogen-bonded ion triples are formed. The nitrate is approximat...

In the title compound, C(13)H(15)N(2) (+)·PF(6) (-), the dihedral angle between the two aromatic rings is 85.48 (7)°. In the crystal, C-H⋯F hydrogen bonds connect the imidazolium and hexa-fluoro-phosphate ions.