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Two pharmaceutical salts of paliperidone, namely, paliperidone benzoate (PLPT·BA) and paliperidone salicylate (PLPT·SA), were successfully synthesized using benzoic acid (BA) and salicylic acid (SA) as starting materials through a solvent evaporation method. Our study rectified the misidentification of PLPT·BA as a co-crystal in previous research by providing single-crystal structure data and further analysis. The salts' structures were confirmed through ΔpKa calculations, single-crystal x-ray diffraction (SCXRD) analysis, powder x-ray diffraction (PXRD), and infrared (IR) spectroscopy, while their solubility was also evaluated. Moreover, significant enhancements in thermal stability were observed for both PLPT·BA and PLPT·SA, with increases of 39 K and 32 K, respectively, in their decomposition temperatures compared to pure PLPT. Additionally, intramolecular charge-assisted hydrogen bonds (N+–H···O) were found in both salts, which crystallized in the monoclinic system with the P 1 ¯ P-1 (2) space group. Furthermore, solubility and dissolution rate experiments indicated slight improvements in their solubility and dissolution rate compared to PLPT. This pioneering research provides crucial data on the single-crystal structures and thermal properties of PLPT·BA and PLPT·SA, laying a foundation for further investigations into their potential applications in drug formulations and pharmacology and optimizing drug formulations for enhanced clinical efficacy. [ABSTRACT FROM AUTHOR]

[Display omitted] • Multi-physical channels response in a novel layered perovskite. • A novel organic–inorganic hybrid perovskite (trans -4-methylcyclohexanamine) 2 [CuCl 4 ] with a high phase transition temperature. With the continuous development of society, the demand for multi-physical channel responsive materials continues to increase, and it is urgent to develop multi-channel responsive materials with excellent properties. Here, in this work, we reported a novel two-dimensional (2D) organic–inorganic hybrid perovskite, (trans -4-methylcyclohexylammonium) 2 [CuCl 4 ] (1), with responsive multi-physical channels. 1 experienced a structural phase transition with switchable thermochromism and dielectric response, which has great potential in the application of responsive materials. Under thermal stimulation, crystal 1 displays a reversible color variation between green and yellow. Crystal structure determination reveals that the distortion of inorganic layers plays a predominant role in the thermochromism during the phase transition process. This finding presents a compelling avenue for developing multi-physical channel responsive materials and contributes valuable insights to the exploration of two-dimensional lead-free perovskites for applications in intelligent window technology. [ABSTRACT FROM AUTHOR]

The rational selection of ligands is vitally important in the construction of new organic–inorganic hybrid three‐dimensional perovskite complexes. As part of an exploration of perovskite‐type materials, two new Na–I compounds based on the piperazine ligand, namely poly[piperazinediium [tri‐μ‐iodido‐sodium]], {(C4H12N2)[NaI3]}n, 1, and catena‐poly[tris(piperazinediium) [[triiodidosodium]‐μ‐iodido] triiodide monohydrate], {(C4H12N2)3[NaI4]I3·H2O}n, 2, have been synthesized by adjusting the stoichiometric ratio of sodium iodide and piperazine, and were characterized by single‐crystal X‐ray diffraction. In the crystal structures of 1 and 2, each NaI cation is linked to six I atoms, but the compounds show completely different configurations. In 1, the structure includes a perovskite‐like array of vertex‐sharing NaI6 octahedra stretching along the direction of the three axes, and each piperazinediium dication is enclosed in the NaI3 perovskite cage. However, in 2, each NaI atom bridges a single I atom to form a one‐dimensional linear chain, and complex intermolecular hydrogen bonds connect these one‐dimensional chains into a three‐dimensional supramolecular network. [ABSTRACT FROM AUTHOR]

[Display omitted] • A new organic-inorganic hybrid material TEACCl·FeCl 4 with an order-disorder phase change. • Enthalpy change of phase transition is high. • A switchable dielectric property can be observed. A new organic-inorganic hybrid material TEACCl·FeCl 4 (1 , TEACCl+ = Et 3 NCH 2 Cl+) with a phase change at 264.3 K was synthesized. 1 was characterized by thermogravimetric, differential scanning calorimetry, single crystal structure determination, dielectric measurement, infrared spectra and ultraviolet-vis spectral measurement. It is worth noting that a reversible phase change appeared near 264.3 K, which is verified by differential scanning calorimetry, single crystal structure determination and dielectric measurement. The corresponding enthalpy change of phase transition equals to 8.17 J·mol−1·K−1 on the heating process and −8.83 J·mol−1·K−1 on the cooling process, indicating 1 can be used as a heat storage material. [ABSTRACT FROM AUTHOR]

As part of an exploration of new coordination polymers, a cadmium-dicyanamide complex, namely poly[benzyltriethylammonium [tri-μ-dicyanamido-κ6 N1: N5-cadmium(II)]], {(C13H22N)[Cd(C2N3)3]} n, has been synthesized by the reaction of benzyltriethylammonium bromide, cadmium nitrate tetrahydrate and sodium dicyanamide in aqueous solution, and characterized by single-crystal X-ray diffraction at room temperature. In the crystal structure, each CdII cation is coordinated by six nitrile N atoms from six anionic dicyanamide (dca) ligands to furnish a slightly distorted octahedral geometry. Neighbouring CdII cations are linked by dicyanamide bridges to construct a two-dimensional anionic layer coordination polymer. One amide N atom in the bridging dca ligand is disordered over two sites. The cations lie between the anionic frameworks and there are no hydrogen-bond interactions between the cations and anions. The organic cations are not involved in the formation of the supramolecular network. [ABSTRACT FROM AUTHOR]

• Two novel pharmaceutical salts of letermovir (LM) were successfully achieved. • This is the first report of a single crystal structure of LM, which could contribute to the development of corresponding drugs. • Salt 1 and salt 2 showed better solubility and stability under wet conditions, and had the potential to replace the bulk drug. Two novel pharmaceutical salts of letermovir (LM) were successfully achieved by a slow reaction in solution containing LM with ethylenediamine (EDA) and diisopropylamine (DIPA). In this article, crystal structure, X-ray diffraction, thermal properties, 1H NMR, 13C NMR, HPLC analysis, stability and solubility of salt 1 and salt 2 have been discussed. Salt 1 crystalized in R 3 space group and salt 2 crystalized in P 3 2 21 space group. The formation of salt was proved by p K a rule and single crystal determination. From the perspective of crystal structure, for salt 1 and salt 2 , the strong hydrogen bond makes the crystal structure more stable. The weak interaction between molecules is further studied by Hirshfeld surface and 2D-fingerprint plots. Notably, this is the first report of a single crystal structure of LM, which could contribute to the development of corresponding drugs. In addition, salt 1 and salt 2 showed better solubility and stability under wet conditions, and had the potential to replace the bulk drug. Two novel pharmaceutical salts of letermovir (LM) were successfully synthesized. [Display omitted] [ABSTRACT FROM AUTHOR]