catena-Poly[[(1,10-phenanthroline)cobalt(II)]-di-μ-azido]

In the crystal structure of the binuclear title complex, [Co(N3)2(C12H8N2)]n, each CoII cation is coordinated by two N atoms from one chelating 1,10-phenanthroline ligand and four azide ligands in a slightly distorted octa­hedral coordination. The two CoII cations of the binuclear complex are related by an inversion centre and are bridged by two symmetry-related azide ligands in both μ1,1 and μ1,3 modes. The μ1,3 bridging mode gives rise to an infinite one-dimensional chain along the a axis, whereas the μ1,1 bridging mode is responsible for the formation of the binuclear CoII complex

catena-Poly[[(pyrimidine-2-carb­oxy­lic acid)iron(II)]-μ-oxalato]

In the title complex, [Fe(C2O4)(C5H4N2O4)]n, the FeII ion is coordinated by two oxalate anions and a pyrimidine-2-carb­oxy­lic acid ligand in a slightly distorted octa­hedral geometry. Each oxalate anion chelates to two FeII ions, forming chains along the a axis. The chains are further connected by O—H⋯O and C—H⋯O hydrogen bonds, stabilizing the structure. An intra­molecular O—H⋯N inter­action results in a five-membered ring

Bis[N,N-bis­(2-hy­droxy­eth­yl)glycinato]cobalt(II)

The asymmetric unit of the title compound, [Co(C6H12NO4)2], contains one half-mol­ecule with the CoII ion situated on an inversion center. Inter­molecular O—H⋯O hydrogen bonds generate a three-dimensional hydrogen-bonding network, which consolidates the crystal packing

Poly[tetra-μ1,1-azido-bis­(μ2-pyrimidine-2-carboxyl­ato)tricopper(II)]

In the title compound, [Cu3(C5H3N2O2)2(N3)4]n, one of the CuII atoms lies on an inversion centre and is octa­hedrally coordinated by two bidentate chelating pyrimidine-2-carboxyl­ate ligands and two azide anions, each of which gives an N:N-bridge to the second inversion-related CuII centre in the formula unit. The second CuII atom is five-coordinated with a distorted square-pyramidal coordination sphere comprising a single bidentate chelating pyrimidine-2-carboxyl­ate anion and three azide N anions, two of which doubly bridge centrosymmetric CuII centres, giving a two-dimensional network structure extending parallel to (010)

Poly[(μ4-1,2,3-benzothia­diazole-7-carboxyl­ato)silver(I)]

In the crystal structure of the title compound, [Ag(C7H3N2O2S)]n, the AgI atom is coordinated by two N atoms and three O atoms of four organic ligands forming a distorted square pyramid. The carboxyl­ate group acts as a bidentate ligand on one AgI atom and as a bridging group for a symmetry-related AgI atom, forming a dimer. Futhermore, the two N atoms of two thia­diazole rings bridge a third symmetry-related AgI atom, forming a six-membered ring. These two frameworks, AgO2Ag and AgN4Ag, extend in three directions, forming a three-dimensionnal polymer. The whole polymer is organized around inversion centers

Poly[aqua(μ1,1-azido)(μ-3H-1,2,3-triazolo[4,5-b]pyridin-3-olato)cobalt(II)]

In the title compound, [Co(C5H3N4O)(N3)(H2O)]n, the cobalt ion is coordinated by three N atoms of two organic ligands, two N atoms of two azide anions and one water molecule in a distorted octahedral geometry. The metal atoms are connected via the ligands into layers, which are further connected by O—H...N and O—H...O hydrogen bonding

2D WSe2 Flakes for Synergistic Modulation of Grain Growth and Charge Transfer in Tin‐Based Perovskite Solar Cells

Abstract Tin (Sn)‐based perovskites with favorable optoelectronic properties and ideal bandgaps have emerged as promising alternatives to toxic lead (Pb)‐based perovskites for photovoltaic applications. However, it is challenging to obtain high‐quality Sn‐based perovskite films by solution process. Here, liquid‐exfoliated 2D transition‐metal dichalcogenides (i.e., MoS2, WS2, and WSe2) with smooth and defect‐free surfaces are applied as growth templates for spin‐coated FASnI3 perovskite films, leading to van der Waals epitaxial growth of perovskite grains with a growth orientation along (100). The authors find that WSe2 has better energy alignment with FASnI3 than MoS2 and WS2 and results in a cascade band structure in resultant perovskite solar cells (PSCs), which can facilitate hole extraction and suppress interfacial charge recombination in the devices. The WSe2‐modified PSCs show a power conversion efficiency up to 10.47%, which is among the highest efficiency of FASnI3‐based PSCs. The appealing solution phase epitaxial growth of FASnI3 perovskite on 2D WSe2 flakes is expected to find broad applications in optoelectronic devices

Gadolinium Sulfate Modified by Formate To Obtain Optimized Magneto-Caloric Effect

Three new Gd^III based coordination polymers [Gd₂(C₂H₆SO)­(SO₄)₃(H₂O)₂]<i>_n</i> (<b>1</b>), {[Gd₄­(HCOO)₂­(SO₄)₅­(H₂O)₆]·H₂O}<i>_n</i> (<b>2</b>), and [Gd­(HCOO)­(SO₄)­(H₂O)]<i>_n</i> (<b>3</b>) were obtained by modifying gadolinium sulfate. With the gradual increase of the volume ratio of HCOOH and DMSO in synthesis, the formate anions begin to coordinate with metal centers; this results in the coordination numbers of sulfate anion increasing and the contents of water and DMSO molecules decreasing in target complexes. Accordingly, spin densities both per mass and per volume were enhanced step by step, which are beneficial for the magneto-caloric effect (MCE). Magnetic studies reveal that with the more formate anions present, the larger the negative value of magnetic entropy change (−Δ<i>S</i>_m) is. Complex <b>3</b> exhibits the largest −Δ<i>S</i>_m = 49.91 J kg^–1 K^–1 (189.51 mJ cm^–3 K^–1) for <i>T</i> = 2 K and Δ<i>H</i> = 7 T among three new complexes