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1. A long-lasting eruption heralds SN 2023ldh, a clone of SN 2009ip

   https://doi.org/10.1051/0004-6361/202554858  

   Pastorello, A; Reguitti, A; Tartaglia, L; Valerin, G; Cai, Y-Z; Charalampopoulos, P; De_Luise, F; Dong, Y; Elias-Rosa, N; Farah, J; et al (September 2025, Astronomy & Astrophysics)

   We discuss the results of the spectroscopic and photometric monitoring of the type IIn supernova (SN) 2023ldh. Survey archive data show that the SN progenitor experienced erratic variability in the years before exploding. Beginning May 2023, the source showed a general slow luminosity rise that lasted for over four months, with some superposed luminosity fluctuations. In analogy toSN 2009ip, we call this brightening ‘Event A’. During Event A,SN 2023ldhreached a maximum absolute magnitude ofM_r = −15.52 ± 0.24 mag. The light curves then decreased by about 1 mag in all filters for about two weeks reaching a relative minimum, which was followed by a steep brightening (Event B) to an absolute peak magnitude ofM_r = −18.53 ± 0.23 mag, replicating the evolution ofSN 2009ipand similar to that of type IIn SNe. The three spectra ofSN 2023ldhobtained during Event A show multi-component P Cygni profiles of H I and Fe II lines. During the rise to the Event B peak, the spectrum shows a blue continuum dominated by Balmer lines in emission with Lorentzian profiles, with a full width at half maximum velocity of about 650 km s⁻¹. Later, in the post-peak phase, the spectrum reddens, and broader wings appear in the Hαline profile. Metal lines with P Cygni profiles and velocities of about 2000 km s⁻¹are clearly visible. Beginning around three months past maximum and until very late phases, the Ca II lines become among the most prominent features, while Hαis dominated by an intermediate-width component with a boxy profile. AlthoughSN 2023ldhmimics the evolution of otherSN 2009ip-like transients, it is slightly more luminous and has a slower photometric evolution. The surprisingly homogeneous observational properties ofSN 2009ip-like events may indicate similar explosion scenarios and similar progenitor parameters. 

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2. Multifaceted Sn–Sn bonding in the solid state. Synthesis and structural characterization of four new Ca–Li–Sn compounds

   https://doi.org/10.1039/C9DT02803J  

   Ovchinnikov, Alexander; Bobev, Svilen (October 2019, Dalton Transactions)

   null (Ed.)

   Four novel ternary phases have been prepared in the system Ca–Li–Sn using both the metal flux method and conventional high-temperature synthesis. Each of the obtained compositions represents its own (new) structure type, and the structures feature distinct polyanionic Sn units. Ca 4 LiSn 6 (space group Pbcm , Pearson symbol oP 44) accommodates infinite chains, made up of cyclopentane-like [Sn 5 ]-rings, which are bridged by Sn atoms. The Sn atoms in this structure are two- and three-bonded. The anionic substructure of Ca 9 Li 6+x Sn 13–x ( x ≈ 0.28, space group C 2/ m , Pearson symbol mS 56) displays extensive mixing of Li and Sn and combination of single-bonded and hypervalent interactions between the Sn atoms. Hypervalent bonding is also pronounced in the structure of the third compound, Ca 2 LiSn 3 (space group Pmm 2, Pearson symbol oP 18) with quasi-two-dimensional polyanionic subunits and a variety of coordination environments of the Sn atoms. One-dimensional [Sn 10 ]-chains with an intricate topology of cis - and trans -Sn–Sn bonds exist in the structure of Ca 9–x Li 2 Sn 10 ( x ≈ 0.16, space group C 2/ m , Pearson symbol mS 42), and the Sn–Sn bonding in this case demonstrates the characteristics of an intermediate between single- and double- bond-order. The peculiarities of the bonding are discussed in the context of the Zintl approach, which captures the essence of the main chemical interactions. The electronic structures of all four compounds have also been analyzed in full detail using first-principles calculations. 

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3. Oxidation of Sn at the Cluster–Support Interface: Sn and Pt–Sn Clusters on TiO ₂ (110)

   https://doi.org/10.1021/acs.jpcc.1c03338  

   Beniwal, Sumit; Chai, Wenrui; Metavarayuth, Kamolrat; Maddumapatabandi, Thathsara D.; Shakya, Deependra M.; Henkelman, Graeme; Chen, Donna A. (August 2021, The Journal of Physical Chemistry C)
4. Stabilization of Sn Anode through Structural Reconstruction of a Cu–Sn Intermetallic Coating Layer

   https://doi.org/10.1002/adma.202003684  

   Wang, Guanzhi; Aubin, Megan; Mehta, Abhishek; Tian, Huajun; Chang, Jinfa; Kushima, Akihiro; Sohn, Yongho; Yang, Yang (October 2020, Advanced Materials)

   null (Ed.)
5. Superconductivity of Electrodeposited Sn Films

   https://doi.org/10.1149/1945-7111/acc3c6  

   Huang, Q. (March 2023, Journal of The Electrochemical Society)

   Tin (Sn) films are electrodeposited on Au seed layers for the investigation of superconductivity. The effects of the presence of suppressing additives in electrolyte, the thickness of Sn films, and the room temperature aging of deposited Sn films on the superconducting transition behavior are systematically studied. In addition, the crystallographic structure of electrodeposited Sn and its evolution along with aging time are characterized and are discussed in conjunction with the superconductivity behavior. The current work represents an important step towards the processing of technologically viable superconducting devices. 

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