expected to exhibit intriguing optical properties. [22,23] This is because the coordinated metal octahedra are spatially isolated by surrounding inorganic or organic cations, resulting in strong exciton confinement and self-trapped exciton (STE) emission effects. The STE emission in 0D lead-free metal halides originates from the lattice deformation of metal halide structures and possesses some typical features, such as broadband PL emission and large Stokes shift. [24][25][26] Recently, a series of 0D lead-free metal halides have been reported to exhibit intriguing STE emissions. [27][28][29][30][31][32][33][34] 0D all-inorganic copper halides are one kind of enthralling materials due to their low toxicity and earth-abundant elements. In particular, Cu atoms are fourfold coordinated with halide ions to form tetrahedral structure, [35] which favors the Jahn-Teller distortion to produce strong STE emission. [36,37] Although the synthesis and optical properties of 0D Cs 3 Cu 2 I 5 NCs have been reported, [38] it is still challenging to prepare high-quality colloidal NCs of 0D all-inorganic copper(I) halides materials with isostructural series (such as Cs 3 Cu 2 X 5, X = I, Br, and Cl), and systematically investigate their halogen-dependent optical properties. Herein, we present the colloidal syntheses and optical characterizations of Cs 3 Cu 2 X 5 (X = I, Br, and Cl) NCs. These colloidal cesium cuprous halide NCs possess well-defined shapes, narrow size distributions, and tunable emissions. Intriguingly, with halogen ions changing from I − to Br − , and Cl − , Cs 3 Cu 2 X 5 NCs exhibit gradually redshifted emission peaks. Meanwhile, the high PL quantum yield (PLQY) of 48.7% is achieved on Cs 3 Cu 2 Cl 5 NCs, while Cs 3 Cu 2 I 5 NCs exhibit considerable air stability over 45 days.In our work, Cs 3 Cu 2 X 5 NCs were obtained via a hot injection method. [39,40] In particular, Cs 3 Cu 2 I 5 NCs were prepared based on a hot plate route in air. Typically, oleylammonium iodide (OLA-I) precursor was injected into 1-octadecene (ODE) solution containing cupric acetate, cesium carbonate and oleic acid (OA) (see details in supporting information, SI) to initiate the reaction. The OLA-I precursor not only offers iodine ion, but also reduces Cu(II) to Cu(I) cations. Subsequently, Cu + combines with Cs + and I − to form Cs 3 Cu 2 I 5 NCs stabilized by OA and OLA ligands. The feeding ratio of inorganic salt precursors and the amount of OA are revealed to play key roles in producing Cs 3 Cu 2 I 5 NCs with pure orthorhombic phase ( Figures S1 and S2, Supporting Information). Figure 1a presents a representative transmission electron microscopy (TEM) image of as-prepared Cs 3 Cu 2 I 5 NCs, 0D lead-free metal halide nanocrystals (NCs) are an emerging class of materials with intriguing optical properties. Herein, colloidal synthetic routes are presented for the production of 0D Cs 3 Cu 2 X 5 (X = I, Br, and Cl) NCs with orthorhombic structure and well-defined morphologies. All these Cs 3 Cu 2 X 5 NCs exhibit broadband blue-green photolum...

Reactions of PdCl with 2 equiv of N,N'-disubstituted-imidazole-2-thiones RRCNS (R = R = Me (1a), Pr (1b), Cy (1c), CMeH (1d); R = Me, R = Ph (1e)) under the different conditions afford five mononuclear complexes trans-[(RRCNS)PdCl] (R = R = Me (2a), Pr (2b), Cy (2c), CMeH (2d); R = Me, R = Ph (2e)) and five binuclear Pd(II) complexes [(PdCl){μ-(RRCNS)}] (R = R = Me (3a), Pr (3b), Cy (3c), CMeH (3d); R = Me, R = Ph (3e)), respectively. Complexes 2a-2e are easily converted into the corresponding 3a-3e by adding equimolar PdCl in refluxing MeOH, while the reverse reaction is achieved at room temperature by addition of 2 equiv of 1a-1e. In 2b, 2d, and 2e, each Pd(II) holds a distorted square planar geometry completed by two trans Cl atoms and two trans S atoms. Complexes 3a-3e have a dimeric [PdS] structure in which two {PdCl} units are interlinked by two N,N'-disubstituted-imidazole-2-thiones. Each Pd(II) adopts a distorted square planar geometry accomplished by two cis Cl atoms and two cis bridging S atoms. Among them, complex 3d has the two largest CMeH groups on the 2 and 5 positions of imidazole-2-thione, the longest Pd-μ-S bond, the largest S-Pd-S angle, and displays the highest catalytic activity toward Suzuki-Miyaura and copper-free Sonogashira cross-coupling reactions, which are confirmed by density functional theory calculations. The results provide an interesting insight into the introduction of various substituent groups into the periphery ligands of coordination complex-based catalysts, which could tune their geometric structures to acquire the best catalytic activity toward organic reactions.

Phase-pure zero-dimensional (0D) Cs4SnX6 (X = Br, I) nanocrystals with high emission efficiencies are successfully prepared for the first time.

High pressure engineering of metal halide perovskites, revealing the structural and photovoltaic performance contributions of different components.

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