The partial substitution of Fe by Co in the parent Sr4Fe4O11 compounds maintains the orthorhombic nuclear structure (Space group Cmmm, 2 root 2ap & times; 2ap & times; root 2ap type, ap = lattice parameter of the cubic perovskite) at room temperature (RT) as suggested by powder synchrotron X-Ray Diffraction. When temperature increases, X-ray diffraction laboratory under N2 associated to thermogravimetric analysis reveal an interesting reversible structural transformation from orthorhombic Cmmm to cubic Pm-3m nuclear structure which is relevant from an oxygen vacancies ordered/disordered phase transition even if a minor loss/uptake oxygen content which should occurs at higher temperature cannot be fully dismissed. Interestingly, the nuclear phase transition is concomitant to an electronic phase transition leading to larger gap (Cmmm phase)/smaller gap (Pm-3m phase) change and, to a significant upturn on the magnetic susceptibility.

Developing affordable and stable electrode materials is crucial for advancing sustainable supercapacitor technologies. In this study, a lead-free Co(II)-halide hybrid material (CoTEA) was synthesized via slow evaporation and evaluated as an electrode for aqueous electrochemical energy storage. Single-crystal X-ray diffraction showed a zero-dimensional structure consisting of isolated tetrahedral units separated by tetraethylammonium cations. Morphological and spectroscopic analyses confirmed the crystalline nature and the Co(II) oxidation state of the material. Optical measurements indicated semiconducting behavior with a band gap of 3.64 eV. The electrochemical response of CoTEA was highly dependent on the electrolyte used. At 5 mV s-1, specific capacitances of 5.01, 22.24, and 21.37 F g-1 were recorded in 1 M H2SO4, 0.5 M Na2SO4, and 6 M KOH, respectively. While Na2SO4 yielded the highest capacitance at the lowest scan rate, KOH demonstrated better rate performance and lower charge-transfer resistance, suggesting more efficient interfacial kinetics. In 6 M KOH, CoTEA achieved a GCD-specific capacitance of 21.41 F g-1 at 0.5 A g-1 and maintained about 85% of its initial capacitance after 3000 cycles. These results underscore the significant impact of electrolyte composition on the charge-storage behavior of CoTEA and present it as a promising, tunable material for aqueous supercapacitor applications.strong influence of electrolyte composition on the charge-storage behavior of CoTEA and highlight it as a promising tunable material for aqueous supercapacitor applications.

Novel Ba2-xSrxInO3F Ruddlesden-Popper phases were synthesized by solid-state routes at high temperatures under Ar and dry air. The structural features were determined through XRD analysis of well-crystallized powders and isolated single crystals. Two In sites were identified with various occupancies, dependent on the Sr content and on the atmosphere applied during annealing. This indium site distribution leads to the consideration of an anionic disorder on the apical site in the vicinity of In. A maximum in the O2-In-O2 bond angles is identified for the Ba1.2Sr0.8InO3F composition and corresponds to a stronger hybridization between the In (s,p) and O(p) orbitals in the equatorial plane, which should be the signature of monovalent indium. 19F MAS NMR investigation recorded at various temperatures shows the F- hopping phenomenon in the mixed (Ba/Sr) environment, which is most present in the Ba1.2Sr0.8InO3F oxyfluoride and linked to the presence of anionic vacancies. Considering the electroneutrality of the composition, monovalent indium should be stabilized in octahedron with a vacant vertex. Excitation (UV range) and emission (visible range) broad bands are clearly detected, but neither excitation nor emission wavelength varies with the Sr content. However, the photoluminescence intensity is strongly correlated with the composition and reaches a maximum for the Ba1.2Sr0.8InO3F compound. Density functional theory calculations allow for the identification of defect states related to anionic vacancies in the band gap, with hybridization mainly between In(s) and O(p) orbitals in the basal plane, thus explaining the self-trapped exciton (STE) mechanism.

Supramolecular chemistry is currently undergoing extensive investigation within the realm of crystal engineering, owing to its remarkable functions in information expression and transfer, self-organization, and molecular recognition. As alternatives to traditional homogeneous and heterogeneous catalysis as well as inorganic semiconductors, polyoxomolybdates (POMs) have been engineered to exhibit diverse properties, including ferroelectricity, ferroelasticity, electrical characteristics, and optical behavior. This research centers on the synthesis of the polyoxomolybdate with the formula [C6H5CH2NH3]6[Mo7O24].3H2O, referred to as HexaBAMo7. The crystal structure demonstrates that amine-based cations, polyatomic anions [Mo7O24]6-, and crystallization water molecules are organized into various supramolecular frameworks ranging from infinite one-dimensional chains to three-dimensional networks through hydrogen bonding and C-H...pi interactions. Infrared spectroscopy was employed to analyze the different functional groups present in the compound. Additionally, thermal stability assessments were conducted using Differential Scanning Calorimetry (DSC) and thermogravimetric analysis (TG). The optical properties were evaluated to ascertain the energy band gap values of 3.36 eV for direct transitions and 2.57 eV for indirect transitions, indicating the semiconductor nature of this material. AC conductivity measurements corroborate this characterization with recorded values of 2 & times; 10-5 S.cm- 1 at 298 K and 6 & times; 10-5 S.cm- 1 at 383 K.

RF magnetron cosputtered amorphous Ge-Bi-Se films were fabricated using polycrystalline GeSe2 and Bi2Se3 targets. Their structural, linear, and nonlinear optical properties were studied to understand compositional influence for future photonic applications. A broader Ge-Bi-Se amorphous region with a noticeably high bismuth atomic percentage (up to at % Bi = 36%) is observed using this deposition method compared to <= 16 at % in the conventional Ge20Se80-x Bi x bulk glass synthesis []. The structural characteristics of the cosputtered films were analyzed using Raman spectroscopy, where increasing bismuth concentration shifted all vibrational bands to the lower energy side with reduced intensity. A decrease in optical band gap energy values from 2.04 (+/- 0.02) eV (Bi atom % = 0) to 0.73 (+/- 0.02) eV (Bi atom % = 36) and the corresponding increase in refractive index value n from 2.41 (+/- 0.01) to 4.09 (+/- 0.01) at telecommunication wavelength indicate the strong influence of bismuth on the optical properties of the films. Third-order nonlinear optical parameters were calculated from linear parameters using semiempirical equations and Sheik-Bahae formalism in order to allow their prediction according to the film composition and taking into account the wavelength of use. Following these simulations, which enabled the selection of promising compositions in terms of optical nonlinearity applications, this work also focused on demonstrating the feasibility of manufacturing ridge waveguides from these cosputtered films by RF magnetron using dry etching with the aim of offering Ge-Bi-Se-based integrated optical circuits.

Perovskite materials have surged to the forefront of materials science, captivating researchers worldwide with their distinctive crystal lattice arrangement and remarkable optical, electric and dielectric attributes. The current study focuses on the development of a novel zero-dimensional (0D) Ge(II)-based hybrid perovskite, formulated as NH3(CH2)(2)NH3GeF6, and synthesized through a gradual evaporation process conducted at room temperature. The crystal structure is characterized by an arrangement of organic cations and isolated octahedral [GeF6](2-) groups. This configuration is stabilized by relatively weak intermolecular bonds. A comprehensive analysis of the material's thermal properties using differential scanning calorimetry (DSC) revealed a distinct phase transition occurring at approximately 323 K, which was further confirmed through electrical measurements. The studied compound provided a broad absorption range across the visible spectrum and an optical band gap of 3.30 eV, indicating its potential for semiconducting applications in optoelectronic devices. Photoluminescence PL analysis displays a blueish broad-band emission with a high color rendering index CRI value of 91, when excited at 325 nm. This emission primarily originates from the self-trapped excitons (STEs) recombination in the inorganic [GeF6](2-). Herein, the temperature-dependent behavior of grain conductivity exhibited an Arrhenius-type pattern, with an activation energy (E-a) of 0.46 eV, confirming the semiconductor nature of the investigated compound. In addition, a deep investigation of the alternating current conductivity, analyzed using Jonscher's law, demonstrates that the conduction mechanism is effectively described by the correlated barrier hopping (CBH) model. The dielectric performances show a significant dielectric constant (epsilon ' similar to 10(3)). Thus, all these interesting physical properties of this hybrid perovskite have paved the way for advancements in various technological applications, particularly in the field of electronic capacitors.

A current challenge in silicon chemistry is to perform liquid-phase synthesis of silicon nanoparticles, which would permit the use of colloidal synthesis techniques to control size and shape. Herein we show how silicon nanoparticles were synthesized at ambient temperature and pressure in organic solvents through a redox reaction. Specifically, a hexacoordinated silicon complex, bis(N,N'-diisopropylbutylamidinato)dichlorosilane, was reduced by a silicon Zintl phase, sodium silicide (Na4Si4). The resulting silicon nanoparticles were crystalline with sizes tuned from a median particle diameter of 15 nm to 45 nm depending on the solvent. Photoluminescence measurements performed on colloidal suspensions of the 45 nm diameter silicon nanoparticles indicated a blue emission signal, attributed to the partial oxidation of the Si nanocrystals or to the presence of nitrogen impurities.

A novel semiconducting Ni(II)-based hybrid material with the formula (C7H12N2) NiCl4, which exhibits interesting optical and electrical properties, is reported. The crystal structure was investigated using SCXRD, whereas physical properties were studied by means of thermal analysis, Ft-Infrared, optical, and electrical measurements. Its crystal packing is formed through organic rings surrounded by inorganic [NiCl4](2- )tetrahedral and stacked along the a-crystallographic axis. This arrangement is stabilized by a dense network of intermolecular hydrogen bonds. The investigated compound displayed a wide absorption range across the visible spectrum, characterized by an optical gap energy of 2.64 eV, indicating its semiconducting nature and efficient sunlight absorption capabilities across various wavelengths. Such features are of utmost importance in achieving a high energy conversion efficiency in solar cell applications. Further analyses of the thermal behavior using differential scanning calorimetry revealed a single-phase transition occurring at around 413 K, which was further confirmed through electrical measurements. A deep investigation of the electric and dielectric performances demonstrated a significant dielectric constant (epsilon' similar to 10(4)) at low frequencies and low dielectric loss at high frequencies. Thus, it highlights its exceptional dielectric potential, particularly in applications related to electronic capacitors.

Nanoparticles can offer an alternative approach to fabricate phase-change materials. The chemical synthesis of GeTe nanoparticles using organometallic precursors exploits high-boiling solvents and relatively high temperatures (close or even above crystallization temperatures), as reported in the available literature. The aim of this work is the preparation of GeTe nanoparticles by a low-temperature synthetic method exploiting new organometallic precursors and common organic solvents. Indeed, different preparation methods and characterization of GeTe nanoparticles is discussed. The characterization of the prepared nanomaterial was performed on the basis of X-ray diffraction, transmission electron microscopy, scanning electron microscopy with energy dispersive X-ray spectroscopy, laser ablation time-of-flight mass spectrometry, Raman scattering spectroscopy, and dynamic light scattering. The results show that the low-temperature synthetic route leads to amorphous GeTe nanoparticles. Exploited organometallic precursor is stabilised by neutral ligand which can be isolated after the reaction and repeatedly used for further reactions. Furthermore, GeTe nanoparticle size can be tuned by the conditions of the synthesis. The aim of this work is preparation of GeTe nanoparticles by low temperature synthetic method exploiting new organometallic precursors. The GeTe nanoparticles are amorphous and characterized by X-ray diffraction, transmission and scanning electron microscopy with energy dispersive X-ray spectroscopy, laser ablation time-of-flight mass spectrometry, Raman scattering spectroscopy and dynamic light scattering. image

Lead halide hybrid perovskite single crystals have been grown using antisolvent vapor-assisted crystallization. The chemical composition and structural model of the crystals have been established using nuclear magnetic resonance and single crystal x-ray diffraction, leading to the formula $\mathrm{F}{\mathrm{A}}_{0.9}\mathrm{M}{\mathrm{A}}_{0.1}\mathrm{Pb}{\mathrm{I}}_{2.23}{\mathrm{Br}}_{0.77}$. The hexagonal crystallographic structure with $P{6}_{3}$/mmc space group has been confirmed by transmission electron microscope study. Through a detailed analysis of the single crystal XRD data, the locations of $\mathrm{F}{\mathrm{A}}^{+}$ and $\mathrm{M}{\mathrm{A}}^{+}$ in the unit cell have been identified, and the off-centering of ${\mathrm{Pb}}^{2+}$ on the octahedral sites has been unveiled, probably due to the Pauli repulsion of the lone pair. This material is a wide-gap semiconductor with ${E}_{g}$ = 2.27 eV and demonstrates photoluminescence activity. The thermal conductivity is disorder-dominated with an extremely low value of $0.17\phantom{\rule{0.16em}{0ex}}\mathrm{W}\phantom{\rule{0.16em}{0ex}}{\mathrm{m}}^{\ensuremath{-}1}\phantom{\rule{0.16em}{0ex}}{\mathrm{K}}^{\ensuremath{-}1}$ from about 75 K up to 325 K. The present investigation on $\mathrm{F}{\mathrm{A}}_{0.9}\mathrm{M}{\mathrm{A}}_{0.1}\mathrm{Pb}{\mathrm{I}}_{2.23}{\mathrm{Br}}_{0.77}$ single crystal demonstrates that low values of thermal conductivities are obtained in this hexagonal family of hybrid halide perovskites, with mixed cationic and anionic disorder.

Due to their remarkable properties, including remarkable porosity and extensive surface area, metal-organic frameworks (MOFs) are being investigated for various applications. Herein, we report the first Co(II)-based mixed ligand MOF, formulated Co-4(HTrz)(2)(d-cam)(2.5)(mu-OH)(3). Its 3D structure framework is composed of helical chains {[Co-4(mu(3)-HTrz)(4)](8+)}(n) connected by d-camphorate ligand building blocks and featured as an extended structure in an AB-AB fashion. The investigated compound displays a wide absorption range across the visible spectrum, characterized by an optical gap energy of 3.7 eV, indicating its semiconducting nature and efficient sunlight absorption capabilities across various wavelengths. The electrochemical performance demonstrated an excellent reversibility, cyclability, structural stability, as well as a specific capacity of up to 100 cycles at a scan rate of 0.1 mVs(-1) and a current density of 50 mAg(-1). Thus, it showcases its ability to retain the capacity over numerous charge-discharge cycles. Additionally, the investigated sample displayed an impressive rate capability during the Li-ion charge/discharge process. Therefore, the material's remarkable electrochemical properties can be ascribed to the synergistic effects of its large specific surface area of 348.294 m(2)g(-1) and well-defined pore size distribution of 20.448 & Aring;, making it a promising candidate for high-performance Li-ion batteries.

The compound CyNH3[HOOC(CH)2COO]·H2O has been obtained using one pot-synthesis process by mixing, in methanol, HOOC(CH)2COOH, CyNH2 and SnPh3Cl in a 1:1:1 molar ratio. X-ray diffraction analysis of the compound reveals that in the crystal structure, hydrogen maleate [HOOC(CH)2COO]- in cis configuration interacts with [CyNH3]+ cations and water molecules to generate an R66(22) ring. The interconnections of the rings via simple (N–H··O and O–H··O) and bifurcated (N–H···(O, O)) hydrogen bonds give rise to a 2D supramolecular structure.

The reaction of Cy2NH2HSeO4.H2Oand SnMe3Cl led to the formation of Cy2NH2SeO4SnMe3 (1), which crystallizes in the orthorhombic space group Pbca with Z = 16, a = 11.59430(10) AÌŠ, b = 19.3138(3)AÌŠ, c = 36.8673(6)AÌŠ, and V = 8255.7(2)AÌŠ3. The asymmetric unit consists of two [SeO 4 SnMe 3 ]- in which the SnMe3 residue is trans coordinated. The complex-anion are linked via NH----O hydrogen bonds which are involved by Cy2NH2+cation. From a supramolecular point of view, the superposition of [SeO4SnMe3]- along a axis are linked by the NH---O of Cy2NH2+cation along c axis giving a tridimensional structure. The characterization of 1 is accompanied by infrared and NMR characterization of two seleniate complexes containing SnMe3 residue to complete the study of reactivity between dialkylammonium seleniate salt and SnMe3Cl molecule.

In the present work, we discuss the synthesis of nontoxic Mn(II) halide coordination polymer and explore the potential light emission properties for solar-cell devises through experimental and computational studies. The crystal structure was unveiled through Single Crystal Diffraction, whereas physical properties were investigated by means of thermal, spectroscopic, magnetic, optical and photoluminescence measurements. The observed left -right handed helical structure is built up from an infinite 1-D chains of Mn(II) octahedra. The polymeric network is stabilized through inter-molecular hydrogen bonding interactions and pi...pi face-to-face interactions. Furthermore, ferro-antiferromagnetic ordering has been proven through magnetic measurements. A deep investigation of the photoluminescence study reveals the presence of a bright bluish light emission with corre-sponding CIE color coordinates of (0.27, 0.35), CCT value of 8092 K and a very high CRI value of 96. The origin of this intense light emission is mainly attributed to the occurrence of the resonant energy and charge transfer processes between Triazolate ligand and inorganic Mn-Cl sub-lattices. Such behavior leads to the conversion of Frenkel excitons localized within the organic part to Mott-Wannier excitons localized in inorganic clusters. Based on these results, we strongly believe that the elaborated material can be a promising candidate for eco-friendly electronic applications.

One pot reactions of phenylphosphonic acid or phenylarsonic acid with cyclohexylamine led to two new organic-inorganic hybrid salts [C6H14N][C6H5PO3H.C6H5PO3H2.H2O] (1) and [(C6H14N)(C6H5AsO3H)] (2) which were investigated by single-crystal X-ray diffraction analysis. Salt 1 crystallizes in the monoclinic system, space group P21/nwith a = 12.3963 (4), b = 6.1123 (2), c = 28.2081 (8) Å, β = 90.426 (1)°, V = 2137.27 (12)Å3 and Z = 4. Salt 2 crystallizes in the monoclinic system, space group P21/c with a = 12.3991 (5), b = 6.5048 (2), c = 18.5466 (7) Å, β = 105.824 (2)°, V = 1439.16 (9) Å3 and Z = 4. In the co-crystal 1, the hydrogen phenylphosphonate anions are organized into dimers via O–H···O H-bonds, whereas the phenylphosphonic acid and the water molecules are connected, through Owater–H···O and O–H···O hydrogen bonding interactions, to form dimers. Inter-species O–H···O hydrogen bonds connect the alternating dimers into anionic infinite chains. The 1D infinite ribbons are linked into an anionic 2D layer-like structure, by means of water molecules through Owater–H···O and O–H···Owater. The cyclohexylammonium interacts via N–H···O hydrogen bonds, to consolidate the compactness of the 2D layer-like structure. In the crystal of salt 2, the hydrogen phenylarsonate anions are organized into dimers through O–H···O H-bonds. Hydrogen bonded dimers are connected by the cyclohexylammoniumcations, through N–H···O hydrogen bonds, leading to the formation of an infinite ribbon. The 1D hydrogen bonded ribbons are interlinked through N–H···O hydrogen bonding interactions giving rise to a 2D layer-like structure.

Electronic spectra, transport properties and multiscale structure comparison between PEDOT:Tos thin films made by two polymerization processes.