The first crystal structures of a dinuclear iron(II) complex with three N1,N2-1,2,4-triazole bridges in the high-spin and low-spin states are reported. Its sharp spin transition, which was probed using X-ray, calorimetric, magnetic, (57)Fe Mossbauer analyses, is also delineated crystalline state by variable-temperature fluorimetry for time.

The chiral dissymmetric tetradentate ligand (S)-6'-(4-phenyloxazolin-2-yl)-2,2'-bipyridine-6-carboxylate (S-Phbipox) leads to the diastereoselective assembly of a homochiral Eu(3+) triangle and highly emissive (quantum yield = 27%) heptanuclear wheel that is largest example luminescent complex reported date. nuclearity controlled by solvent cation. All compounds show large circularly polarized luminescence with an activity varies nature (highest for trimer).

We report herein an efficient gold(I)-catalyzed post-Ugi domino dearomatization/ipso-cyclization/Michael sequence that enables access to libraries of diverse (hetero)arene-annulated tricyclic heterocycles. This process affords novel complex polycyclic scaffolds in moderate good yields from readily available acyclic precursors with excellent chemo-, regio-, and diastereoselectivity. The power this strategy has been demonstrated by the rapid synthesis 40 highly functionalized polyheterocycles...

Metal–organic frameworks (MOFs) have emerged as an important, yet highly challenging class of electrochemical energy storage materials. The chemical principles for electroactive MOFs remain, however, poorly explored because precise and structural control is mandatory. For instance, no anionic MOF with a lithium cation reservoir reversible redox (like conventional Li-ion cathode) has been synthesized to date. Herein, we report on electrically conducting cathodes the generic formula...

Coordination polymers (CPs) made of redox-active organic moieties and metal ions emerge as an important class electroactive materials for battery applications. However, the design synthesis high voltage alkali-cation reservoir anionic CPs remains challenging, hindering their practical Herein, we report a family electrically conducting with general formula A

An asymmetrically substituted fluorescent difluoroboron dipyrromethene (BODIPY) dye, with a phenylamino group at the 3-position of BODIPY chromophore, has been synthesized by nucleophilic substitution 3,5-dichloro-8-(4-tolyl)-4,4-difluoro-4-bora-3a,4a-diaza-s-indacene. The solvent-dependent spectroscopic and photophysical properties have investigated means UV−vis spectrophotometry steady-state time-resolved fluorometry reflect large effect anilino substituent on fluorescence characteristics....

Co-crystal screening was applied under the assumption that two molecules having relatively similar chemical structures are likely to form co-crystals with identical coformers, in an attempt improve co-crystal efficiency. Piracetam and Levetiracetam were used as model compounds. Both racetam compounds have a molecular structure. Eleven of been described literature using ten different acids. These acids selected potential coformer candidates for preparation co-crystals. Four successfully...

How to train your silane: A new family of chiral copper(I) complexes that bear a bifluoride counteranion were prepared and used in the first example enantioselective transfer silyl group an aldehyde. This procedure provides fast access non-racemic α-hydroxysilanes high enantioselectivities.

We have studied a series of eight closely related N-salicylidene-4-amino-1,2,4-triazole molecules 1–8, obtained by condensation the corresponding aldehyde with 4-amino-4H-1,2,4-triazole. 1H NMR spectroscopy in solution revealed presence single structure at least DMSO-d6. According to single-crystal X-ray diffraction, it was established that crystal structures 5–8 each are stabilized linear intramolecular hydrogen bond O–H⋯N type, formed between o-OH atom phenolic ring and imine nitrogen...

The dynamic uptake behaviour of a gaseous guest has been observed crystallographically, yielding unique and ever-changing set host–guest interactions that will drive the improvement high-capacity iodine capture materials.

Abstract Processes leading to enantiomerically pure compounds are of utmost importance, in particular for the pharmaceutical industry. Starting from a racemic mixture, crystallization‐induced diastereomeric transformation allows theory 100 % desired enantiomer. However, this method has inherent limiting requirement organic compound form salt. Herein, limitation is lifted by introducing cocrystallization context thermodynamic deracemization, with process applied model chiral fungicide. We...

We present a new colorimetric chemosensor of formula [Fe(H2btm)2(H2O)2]Cl2 (1) (H2btm = di(1H-tetrazol-5-yl)methane), allowing to detect at real time, with high selectivity and ultra-sensitivity, 14 different volatile organic compounds (VOCs) hazardous gases (HGs), in particular amines, which are detected very quickly (<2 min) sensitivity (0.58 ppm for ammonia (NH3), 0.62 hydrazine (NH2–NH2), 0.45 isobutylamine, 0.71 diethylamine). The detection is accompanied by significant fast color...

A cocrystal screening of a series chiral target compounds was performed in order to investigate the propensity for two optically active cocrystallize an enantiospecific manner. Thirteen novel systems were identified, out which 11 are and present diastereomeric pair, yielding total 15 cocrystals. Six these structurally characterized this study. meticulous search Cambridge Structural Database (CSD) has allowed expanding The results led us conclusion that cocrystallization seems be common rule...

Six conformationally restricted BODIPY dyes with fused carbocycles were synthesized to study the effect of conformational mobility on their visible electronic absorption and fluorescence properties. The symmetrically disubstituted compounds (2, 6) have bathochromically shifted spectral maxima compared those respective asymmetrically monosubstituted (1, 5). Fusion conjugation extending rings α,β-positions core is an especially effective method for construction boron dipyrromethene absorbing...

A mononuclear iron(II) neutral complex (1) is screened for sensing abilities a wide spectrum of chemicals and to evaluate the response function toward physical perturbation like temperature mechanical stress. Interestingly, 1 precisely detects methanol among an alcohol series. The process visually detectable, fatigue-resistant, highly selective, reusable. ability attributed molecular sieving subsequent spin-state change iron centers, after crystal-to-crystal transformation.

Lysine assisted ratiometric monomer to excimer conversion of pyrene derivatives allows intracellular lysine detections.

Raising the operating potential of organic positive electrode materials is a crucial challenge if they are to compare with lithium-ion inorganic counterparts. Although many efforts have been directed on tuning through substituent electronic effect, chemistries than can operate above 3 V vs Li+/Li0, and thus be air stable in Li-reservoir form (alike conventional Li-ion materials) remain finger-counted. Herein, we report new n-type material—the tetralithium...

Electrolytes consisting of sodium bis(fluorosulfonyl)imide (NaFSI) dissolved in glymes (monoglyme, diglyme, and triglyme) were characterized by FT-Raman spectroscopy 13C, 17O, 23Na NMR spectroscopy. The glyme:NaFSI molar ratio was varied from 50:1 to 1:1, it observed that, the dilute electrolytes, salt is completely dissociated into solvent separated ion pairs (SSIPs). However, contact (CIPs) aggregates (AGGs) become predominant species more concentrated solutions. Some electrolytes with...

Proline has been widely used for various cocrystallization applications, including pharmaceutical cocrystals. Combining enantiopure and racemic flurbiprofen proline, we discovered 18 new crystal structures. Liquid-assisted grinding proved highly efficient to explore all the variety of forms. A unique combination state-of-the-art characterization techniques, comprising variable temperature in situ X-ray diffraction ball-milling, along with other physicochemical methods density functional...

A modular and streamlined synthetic strategy for the generation of bridged indole alkaloid-like heterocycles from easily available building blocks is elaborated. This approach utilizes an Ugi four-component reaction, establishing diversity, followed by efficient cationic gold-triggered intramolecular cascade non-oxidative dearomative spirocarbocyclization/concerted [4 + 2] cyclization cascade, furnishing these architecturally complex distinct heterocyclic scaffolds with good diastereoselectivity.

In this paper, we identified a cocrystal conglomerate of mandelic acid using drug compound as coformer. We then developed chiral resolution process based on preferential cocrystallization. Several versions such were explored and optimized, leading to successful acid, evidencing the efficiency our system. Excellent enantiopurity (98–99%) was obtained with that can run for multiple cycles.

A chiral supramolecular Fe II 4 L metal-organic cage able to detect NH 3(g) at room temperature with fast response time and superior selectivity, which we used monitor food safety 4°C on fresh bacon bits.

In the rising advent of organic Li-ion positive electrode materials with increased energy content, chemistries high redox potential and intrinsic oxidation stability remain a challenge. Here, we report solid-phase reversible electrochemistry oximate functionality. The disclosed chemistries, including cyclic, acyclic, aliphatic, tetra-functional stereotypes, uncover complex interplay between molecular structure electroactivity. Among exotic features, most appealing one is electrochemical...

This study explores the cocrystallization between drug praziquantel (PZQ) and nutraceutical curcumin (CU). The investigation revealed two novel solid forms: a cocrystal solvate with ethyl acetate non-solvated cocrystal. drug-nutraceutical is identi-fied as “generally recognized safe” (GRAS) praziquantel-curcumin-ethyl (2:1:1) co-crystal solvate. latter undergoes desolvation, leading to formation of praziquan-tel-curcumin (2:1) has molecules occupying voids minimal interactions within crystal...