A NEW POLYMORPH OF THE [ReCl3(MeCN)(PPh3)2] COMPLEX AND ITS OXIDATION PRODUCTS

Journal of Structural Chemistry - A new polymorph of the [ReCl3(MeCN)(PPh3)2] complex is synthesized and characterized by single crystal X-ray diffraction (XRD). Its recrystallization from the...     

Unexpectedly Long Lifetime of the Excited State of Benzothiadiazole Derivative and Its Adducts with Lewis Acids

We report a study of photoluminescent properties of 4-bromo-7-(3-pyridylamino)-2,1,3-benzothiadiazole (Py-btd) and its novel Lewis adducts: (PyH-btd)₂(ZnCl₄) and [Cu₂Cl₂(Py-btd)₂{PPO}₂]·2C₇H₈ (PPO = tetraphenyldiphosphine monoxide), whose crystal structure was determined by X-ray diffraction analysis. Py-btd exhibits a lifetime of 9 microseconds indicating its phosphorescent nature, which is rare for purely organic compounds. This phenomenon arises from the heavy atom effect: the presence of a bromine atom in Py-btd promotes mixing of the singlet and triplet states to allow efficient singlet-to-triplet intersystem crossing. The Lewis adducts also feature a microsecond lifetime while emitting in a higher energy range than free Py-btd, which opens up the possibility to color-tune luminescence of benzothiadiazole derivatives.     

THE PREPARATION OF RHODIUM(III) NITRITE COMPLEXES WITH ETHYLENEDIAMINE

Journal of Structural Chemistry - Rhodium nitromonoethylenediamine complexes with compositions K[Rh(en)(NO2)4] (I), (Me4N)[Rh(en)(NO2)4]·2H2O (II), [Rh(en)(H2O)(NO2)3]·H2O (III),...     

FIRST EXAMPLES OF MOLECULAR POLYCHALCOGENIDE COMPLEXES OF THULIUM

Journal of Structural Chemistry - Two new polychalcogenide complexes of thulium are obtained by the interaction of $$[\text{Cp}'''_2 \text{Tm}]$$...     

Investigation of coherent Vavilov-Cherenkov radiation in the millimeter wavelength range generated in PTFE and paraffin target

In this paper, we present an experimental observation of coherent Cherenkov radiation in the millimeter wavelength range. Coherent Cherenkov radiation is generated by a 6.1-MeV bunched electron beam passing by dielectric targets (PTFE and paraffin). The characteristics of Cherenkov and diffraction radiation measured under the same conditions are compared. The experiment is carried out with the electron beam of the microtron at Tomsk Polytechnic University.     

Structural Features of Mixed Anions (Мо7 – хWхO24)6– and Their Packing in the [Pd(NH3)4]3(Мо7 – хWxO24)⋅6H2O Crystal Structure

Crystallography Reports - [Pd(NH3)4]3(Мо7 – хWxO24)?6H2O crystals with different Mo/W ratios have been formed as a result of the crystallization of a...     

A Comparison of Tissue Spray and Lipid Extract Direct Injection Electrospray Ionization Mass Spectrometry for the Differentiation of Eutopic and Ectopic Endometrial Tissues

Recent research revealed that tissue spray mass spectrometry enables rapid molecular profiling of biological tissues, which is of great importance for the search of disease biomarkers as well as for online surgery control. However, the payback for the high speed of analysis in tissue spray analysis is the generally lower chemical sensitivity compared with the traditional approach based on the offline chemical extraction and electrospray ionization mass spectrometry detection. In this study, high resolution mass spectrometry analysis of endometrium tissues of different localizations obtained using direct tissue spray mass spectrometry in positive ion mode is compared with the results of electrospray ionization analysis of lipid extracts. Identified features in both cases belong to three lipid classes: phosphatidylcholines, phosphoethanolamines, and sphingomyelins. Lipids coverage is validated by hydrophilic interaction liquid chromatography with mass spectrometry of lipid extracts. Multivariate analysis of data from both methods reveals satisfactory differentiation of eutopic and ectopic endometrium tissues. Overall, our results indicate that the chemical information provided by tissue spray ionization is sufficient to allow differentiation of endometrial tissues by localization with similar reliability but higher speed than in the traditional approach relying on offline extraction.

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New red-luminescent cadmium coordination polymers with 4-amino-2,1,3-benzothiadiazole

New polymeric cadmium complexes, α-[CdLCl₂]_n (1), [CdL₂Cl₂]_n (2) and β-[CdLCl₂]_n (3) (L = 4-amino-2,1,3-benzothiadiazole), were obtained as products of the reaction of CdCl₂ with L. The synthetic procedures allowing isolation of pure 1–3 were optimized. The structures of 1–3 were established by single-crystal X-ray diffraction and the compounds were characterized by UV–Vis and IR spectroscopy. In these compounds, L is either μ-bridging (1) or terminal (2 and 3). The UV–Vis spectra of the complexes in the solid state resemble that of free L. However, coordination of L leads to a significant shift of emission in photoluminescence spectra from yellow (free L) to red (1–3).     

Cyclometallation of the Dimethylamide Ligand in the Reaction of Ta(NMe2)5 with CS2

Russian Journal of Coordination Chemistry - The reaction of Ta(NMe2)5 with CS2 resulted in the isolation of azametallacyclopropane complex [Ta(MeDtc)3(η2-CH2NMe)] (I, MeDtc =...     

CONFORMATIONAL DUALISM OF DIPYRIDYL-SUBSTITUTED FORMAMIDINE

Journal of Structural Chemistry - A new polymorph of the β-modification of N,N′-di(pyridin-2-yl)formamidine that is more thermodynamically stable than the known α-modification is...