Inorganics

12 pages, 3253 KiB

Open AccessArticle

Photoluminescent Coordination Polymers Based on Group 12 Metals and 1H-Indazole-6-Carboxylic Acid

by Antonio A. García-Valdivia, Estitxu Echenique-Errandonea, Gloria B. Ramírez-Rodríguez, José M. Delgado-López, Belén Fernández, Sara Rojas, Javier Cepeda and Antonio Rodríguez-Diéguez

Inorganics 2021, 9(3), 20; https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics9030020 - 22 Mar 2021

Cited by 5 | Viewed by 2562

Abstract

Two new coordination polymers (CPs) based on Zn(II) and Cd(II) and 1H-indazole-6-carboxylic acid (H₂L) of general formulae [Zn(L)(H₂O)]_n (1) and [Cd₂(HL)₄]_n (2) have been synthesized and fully [...] Read more.

Two new coordination polymers (CPs) based on Zn(II) and Cd(II) and 1H-indazole-6-carboxylic acid (H₂L) of general formulae [Zn(L)(H₂O)]_n (1) and [Cd₂(HL)₄]_n (2) have been synthesized and fully characterized by elemental analyses, Fourier transformed infrared spectroscopy and single crystal X-ray diffraction. The results indicate that compound 1 possesses double chains in its structure whereas 2 exhibits a 3D network. The intermolecular interactions, including hydrogen bonds, C–H···π and π···π stacking interactions, stabilize both crystal structures. Photoluminescence (PL) properties have shown that compounds 1 and 2 present similar emission spectra compared to the free-ligand. The emission spectra are also studied from the theoretical point of view by means of time-dependent density-functional theory (TD-DFT) calculations to confirm that ligand-centred π-π* electronic transitions govern emission of compound 1 and 2. Finally, the PL properties are also studied in aqueous solution to explore the stability and emission capacity of the compounds. Full article

(This article belongs to the Special Issue Functional Coordination Polymers and Metal–Organic Frameworks)

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12 pages, 2621 KiB

Open AccessArticle

Synthesis and Characterization of NaCd_0.92Sn_1.08, Na(Cd_0.28Sn_0.72)₂ and Na₂CdSn₅ with Three-Dimensional Cd-Sn Frameworks

by Yuki Asamiya, Takahiro Yamada and Hisanori Yamane

Inorganics 2021, 9(3), 19; https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics9030019 - 06 Mar 2021

Cited by 1 | Viewed by 1832

Abstract

The crystal structures of three new ternary compounds, NaCd_0.92Sn_1.08 (I), Na(Cd_0.28Sn_0.72)₂ (II), and Na₂CdSn₅ (III) synthesized in a sodium-cadmium-tin system were determined by single-crystal X-ray analysis to be the following: (I) LiGeZn-type [...] Read more.

The crystal structures of three new ternary compounds, NaCd_0.92Sn_1.08 (I), Na(Cd_0.28Sn_0.72)₂ (II), and Na₂CdSn₅ (III) synthesized in a sodium-cadmium-tin system were determined by single-crystal X-ray analysis to be the following: (I) LiGeZn-type structure (hexagonal, a = 4.9326(1) Å, c = 10.8508(3) Å, space group P-6m2); (II) CaIn₂-type structure (hexagonal, a = 4.8458(2) Å, c = 7.7569(3) Å, P6₃/mmc); and (III) isotype with tI-Na₂ZnSn₅ (tetragonal, a = 6.4248(1) Å, c = 22.7993(5) Å, I-42d). Each compound has a three-dimensional framework structure mainly composed of four-fold coordinated Cd and Sn atoms with Na atoms located in the framework space. Elucidation of the electrical properties of the polycrystalline samples indicated that compounds (I) and (II) are polar intermetallics with metallic conductivity, and compound (III) is a semiconducting Zintl compound. These properties were consistent with the electronic structures calculated using the ordered structure models of the compounds. Full article

(This article belongs to the Section Inorganic Solid-State Chemistry)

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32 pages, 14173 KiB

Open AccessReview

CO₂ Derivatives of Molecular Tin Compounds. Part 2: Carbamato, Formato, Phosphinoformato and Metallocarboxylato Complexes

by Laurent Plasseraud

Inorganics 2021, 9(3), 18; https://0-doi-org.brum.beds.ac.uk/10.3390/inorganics9030018 - 24 Feb 2021

Cited by 3 | Viewed by 2517

Abstract

Single-crystal X-ray diffraction structures of organotin compounds bearing hemicarbonate and carbonate ligands were recently reviewed by us—“CO₂ Derivatives of Molecular Tin Compounds. Part 1: Hemicarbonato and Carbonato Complexes”, Inorganics 2020, 8, 31—based on crystallographic data available from the Cambridge Structural [...] Read more.

Single-crystal X-ray diffraction structures of organotin compounds bearing hemicarbonate and carbonate ligands were recently reviewed by us—“CO₂ Derivatives of Molecular Tin Compounds. Part 1: Hemicarbonato and Carbonato Complexes”, Inorganics 2020, 8, 31—based on crystallographic data available from the Cambridge Structural Database. Interestingly, this first collection revealed that most of the compounds listed were isolated in the context of studies devoted to the reactivity of tin precursors towards carbon dioxide, at atmospheric pressure or under pressure, thus highlighting the suitable disposition of Sn to fix CO₂. In the frame of a second part, the present review carries on to explore CO₂ derivatives of molecular tin compounds by describing successively the complexes with carbamato, formato, and phosphinoformato ligands, and obtained from insertion reactions of carbon dioxide into Sn–X bonds (X = N, H, P, respectively). The last chapter is devoted to X-ray structures of transition metal/tin CO₂ complexes exhibiting metallocarboxylato ligands. As in Part 1, for each tin compound reported and when described in the original study, the structural descriptions are supplemented by synthetic conditions and spectroscopic data. Full article

(This article belongs to the Special Issue Hypercoordinated Organotin Compounds)

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Inorganics, Volume 9, Issue 3 (March 2021) – 3 articles

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