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Thermal behavior including the cold crystallization of a Schiff base complex bearing two methyl groups was investigated. Additionally, the effect of alkoxy chain length was studied.

The alkylated diarylethene molecules exhibited cold crystallization, and their thermal behavior can be photo-controlled.

The change in alkyl substitution position and alkyl chain length of azo molecules led to the variation in cold crystallization behavior.

Atmospheric gas molecules, such as H2O and O2, are well-known to crucially affect the performance of various organic devices, and are practically avoided by device fabrications in a vacuum followed...

Molecules exhibiting cold crystallization, an exothermic phenomenon in heating following supercooling, can be used as a heat storing material. On the other hand, examples in non-polymers are still ...

The 1 : 1 mixture of adenine and thymine both substituted with dodecyl groups exhibited supercooling and heat storage phenomena including cold crystallization. The unique flexible π-conjugated cores formed through complementary hydrogen bonds with reverse Hoogsteen patterns induced the curious thermal behavior.

A series of silver(II) complexes of 5RS,12SR-1,5,8,12-tetramethyl-1,4,8,11-tetraazacyclotetradecane (L) have been synthesized and characterized by X-ray crystallographic analysis and UV–vis absorption spectra. The crystal structure of [AgL(ClO4)2] (1), [AgL(NO3)2]·CH3OH (2), [AgL(H2O)2]Cl2 (3), and [AgL(H2O)2]Br2 (4) showed the macrocyclic ligand L to be in the stable trans-III structure with C-methyl groups at equatorial positions. To our knowledge, this is the first report on the single crystal X-ray structural analysis of halides of silver(II) complex. Usually, silver ions form insoluble inorganic halides, but the stabilization of divalent silver ion by L, enabled characterization of the complex both in the solutions and in crystals. UV–vis analysis revealed that all complexes were in the form of [AgL(H2O)2]2+ in aqueous solution. These complexes in aqueous solution were found to decompose gradually and lose orange color. The decomposition rate constants of these complexes were evaluated as 0.1012, 0.0971, 0.0981, and 0.2104 h−1 for complexes 1–4, respectively. The decomposition was accelerated by Br− and I− anions.

Two-dimensional self-assembled structures formed by diketopyrrolopyrrole Pigment Red 254 (3,6-bis(4-chlorophenyl)-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione) and its alkyl-derivatives at the liquid...

The alkyl-derivatized diketo-pyrrolo-pyrrole pigment shows complicated thermal behavior. It shows polymorphism, cold crystallization (first report for pigments and dyes), and solid–solid transition...

Assembled structures of dyes have great influence on their coloring function. For example, metal ions added in the dyeing process are known to prevent fading of color. Thus, we have investigated the influence of an addition of copper(II) ion on the surface structure of alkyl-derivatized indigo. Scanning tunneling microscope (STM) analysis revealed that the copper(II) complexes of indigo formed orderly lamellar structures on a HOPG substrate. These lamellar structures of the complexes are found to be more stable than those of alkyl-derivatized indigos alone. Furthermore, 2D chirality was observed.

Background Oral colestimide was reported to lower the concentration of PCDDs, PCDFs, and PCB in the blood of humans. A pilot study showed that the arithmetic mean total TEQ concentrations of PCDDs, PCDFs, and PCBs in the blood of subjects after the trial decreased approximately 20 % compared to pre-trial levels, suggesting that colestimide could decrease human dioxin levels. We designed the current clinical trial study based on this information. In this study, we examined whether colestimide could reduce the individual congener concentrations of PCDDs, PCDFs, and PCBs in the blood of Yusho patients. Methods Out of the 36 Yusho patients who participated in the clinical trial, 26 patients self-administered colestimide 3 g/day orally for 6 months. The concentrations of PCDDs, PCDFs and PCBs in the blood of 26 Yusho patients before the trial were compared with those after the trial. Results The arithmetic mean total TEQ concentrations of PCDDs, PCDFs, non-ortho PCBs, and mono-ortho PCBs in the blood of the 26 Yusho patients before and after the clinical trial were 42–303 (mean: 130, median: 120) and 43–283 (mean: 132, median: 118) pg TEQ/g lipid, respectively. The sums of the concentrations of 58 PCB congeners measured in the blood of Yusho patients before and after the trial were 321–2643 (mean: 957, median: 872) and 286–2007 (mean: 975, median: 806) ng/g lipid, respectively, indicating that the concentrations of PCDDs, PCDFs, and PCBs after the trial were almost the same as those before the trial. Among congeners of PCDDs, PCDFs, dioxin-like PCBs, and non-dioxin-like PCBs, most congeners of these compounds did not show a statistically significant decrease after the trial. Conclusion Colestimide may not be beneficial in reducing the high blood levels of dioxin-like compounds in Yusho patients.

2016