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The article titled "Cover Feature: AcSac, SacSac, and SacNac, the Forgotten Sulfur-Based Ligands and their Reactivity in the Formation of Main and Transition Metal Complexes" explores the use of sulfur-based ligands in the synthesis of p-block and transition metal compounds. The authors highlight the re-emergence of this chemistry in recent years, particularly through the use of Lawesson's reagent as a mild sulfur-source for ligand synthesis. The article draws parallels between the beauty of monarch butterflies and geothermal sulfurated waters to the efforts of spreading this chemistry to different research fields. For more information, readers can refer to the review by J. Rangel-Garcia, C.E. Rivas, O. Serrano, and C. Cristobal. [Extracted from the article]

In this work, the synthesis and reactivity of seven-membered palladacycles are described, and a novel bi-pyridine synthesis in a catalytic pathway is reported. Neophyl-palladacycle(i) reacts with an excess of 2-Br-pyridine, giving the desired new binuclear seven-membered palladacycle (1) and unexpectedly, a bipyridine complex, [Pd(BiPy)Br2]. ESI-HRMS experiments show that fragmentation of the Pd–Br bond in 1 can take place producing unusual two coordinated Pd(ii) molecular ions, [Pd(NeoPyR)]+. [ABSTRACT FROM AUTHOR]

The synthesis of four rhodium(II) paddlewheel complexes bearing axial aromatic amines and coumarin ligands, with formula [Rh2(OAc)4(L)2] (L = NH2Mesityl (1), NH2Dip (2), NH2Couma (3), coumarin (4)), prompted by microwave irradiation, was carried out successfully. All of the complexes were characterized by the melting point, elemental analysis, NMR, IR, and UV/Visible spectroscopy. Additionally, the structure of complexes 1-2 and 4 was corroborated by single-crystal X-ray diffraction. Cyclic voltammetry, ESI-MS, and tandem MS analyses were carried out in compound 1 for gaining further insight into its stability. Finally, a DFT study shows that complexes 1–4 are the thermodynamic products, having as intermediates complexes 1′–4′ which, under our experimental conditions, cannot be isolated. [ABSTRACT FROM AUTHOR]

The bis(silyl)triazene compound 2,6-(Me3Si)2-4-Me-1-(NNNC4H8)C6H2 ( 4) was synthesized by double lithiation/silylation of 2,6-Br2-4-Me-1-(NNNC4H8)C6H2 ( 1). Furthermore, 2,6-bis[3,5-(CF3)2-C6H3]-4-Me-C6H2-1-(NNNC4H8)C6H2 derivative 6 can be easily synthesized by a C,C-bond formation reaction of 1 with the corresponding aryl- Grignard reagent, i.e., 3,5-bis[(trifluoromethyl)phenyl]magnesium bromide. Reactions of compound 4 with KI and 6 with I2 afforded in good yields novel phenyl derivatives, 2,6-(Me3Si)2-4-MeC6H2I and 2,6-bis[3,5-(CF3)2C6H3]-4-MeC6H2I ( 5 and 7, resp.). On the other hand, the analogous m-terphenyl 1,3-diphenylbenzene compound 2,6-bis[3,5-(CF3)2C6H3]C6H3I ( 8) could be obtained in moderate yield from the reaction of (2,6-dichlorophenyl)lithium and 2 equiv. of aryl- Grignard reagent, followed by the reaction with I2. Different attempts to introduce the tBu (Me3C) or neophyl (PhC(Me)2CH2) substituents in the central ring were unsuccessful. All the compounds were fully characterized by elemental analysis, melting point, IR and NMR spectroscopy. The structure of compound 6 was corroborated by single-crystal X-ray diffraction measurements. [ABSTRACT FROM AUTHOR]

Graphical abstract Neutral and cationic nickel, palladium and platinum complexes containing a new N,N,S-tridentate ligand have been prepared and characterized. The structure of the ligand and eight complexes was determinate by X-ray crystallographic analysis. Ligand can be both mono- or di-deprotonated under mild reaction conditions. Studies in Heck reaction and antiproliferative activities are reported. Abstract Organometallic and coordination nickel, palladium and platinum complexes, neutral and cationic, with general formula [M(κ3-SacNac)X] and [M(κ3-SacNac)L′][BPh 4 ] (where M = Ni, Pd and Pt, X = Me, Cl, 1 – 6 ; M = Ni, X = N 3 , SMe, 7 – 8 ; M = Pd, X = I, 13 ; M = Ni and Pd, L′ = PPh 3 , 9 – 10 ; M = Ni and Pt, X = PMe 3 , dmso, 11 – 12) containing a new SacNac N,N,S-tridentate ligand [C 6 H 5 (S)CCH 2 C(N-CH 2 CH 2 NHC 6 H 5)CH 3 ] were synthetized and obtained as microcrystalline solids. Compounds 2 – 13 were fully characterized by elemental analysis, IR, 1D and 2D NMR spectroscopy. The structure of the ligand and eight complexes was determined by X-ray crystallographic analysis. The ligand can be both mono- or bi-deprotonated under mild reaction conditions. Results in Heck reaction and antiproliferative activities are reported. [ABSTRACT FROM AUTHOR]

Gallium (Ga) ion-doped TiO 2 (Ga-TiO 2 ) nanocomposite with small particle size (9-10 nm) and high surface area (104 m 2 /g) has been easily synthesized via sol-gel method at low temperature by using low-valent GaI as a doping precursor. The structural and morphological characterization of Ga-TiO 2 was carried out with standard analytical and spectroscopic techniques. Ga doping into the TiO 2 matrix inhibited a phase transformation from anatase to rutile (photocatalytically inactive) form, even at a higher temperature of 750 °C. Finally, Ga-TiO 2 nanocomposite showed high photocatalytic activity and exhibited 97% degradation of acid violet 63 dye within 60 min. The dye degradation rate constant was calculated as 1.6 × 10 -1 and 1.4 × 10 -1 min -1 under UV and white light irradiation, respectively, which is higher, as compared to the previously reported Ga-TiO 2 composites to date.

Herein, three novel Pt(ii) complexes with formula [ trans -Pt(Br-PyBenz-X)(Cl) 2 (DMSO)] (1-3) having Br-pyridylbenz-(imida, oxa or othia)-zole (L 1-3 ) derivatives as potential bidentate ligands, under an unusual κ 1 -N-coordination mode are reported. All compounds were obtained straightforwardly via reaction of corresponding L PB1-3 and [Pt(Cl) 2 (DMSO) 2 ] (DMSO = dimethyl sulfoxide), at 100 °C in acetonitrile, respectively. 1-3 complexes were characterized by analytical and spectroscopic data: melting point, FT-IR, Raman, UV/Vis and NMR experiments. Cyclic voltammetry studies show an irreversible two-electron process at -0.50 and -0.51 V, which was ascribed to the Pt(ii)/Pt(iv) couple, for complexes 2 and 3. The crystal structure of complex 2 was elucidated by single-crystal X-ray diffraction, where the platinum atom exhibits a square plane geometry, where L PB2 adopts an unusual mono-coordinated mode via an N-κ 1 -benzoxazole ring. According to DFT calculations the first N-coordination exchanging one DMSO molecule is favourable, while the second N-coordination is highly impeded., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)