Abstract
Metal chalcogenide cluster compounds are interesting substances by virtue of their intrinsic electronic and optical properties and their potential usage as single-source precursors for semiconductor materials. Herein, the synthesis and structural characterization of six new [HgTe]-based cluster compounds derived from bis(2-pyridyl)ditellane (oPy2Te2), and different mercury salts are described: four neutral clusters of the composition [Hg4(PPh3)2(μ-oPyTe)6Cl2] (1), [Hg4(PPh3)2(μ-oPyTe)6Br2] (2), [Hg4(PPh3)2(μ-oPyTe)6I2]⋅DMF (3) and ([Hg8(μ-oPyTe)12SCl2]⋅5.25DMF (4), and the two zwitterionic clusters [Hg8(μ-HoPyTe)0.93(μ-oPyTe)11.07SBr2.93])⋅7.62DMF (5) and [Hg8(μ-HoPyTe)0.83(μ-oPyTe)11.17SI2.83])⋅7.25DMF (6) (oPy = 2-pyridyl). The compounds were studied by single-crystal X-ray diffraction, FT-IR spectroscopy, and confocal Raman microspectroscopy. Furthermore, the optical energy gaps of the compounds were estimated by solid-state UV–Vis diffuse reflectance spectroscopy. The compounds with the smaller core structure (1–3) presented the larger Eg values, confirming small-particle optical properties’ strong dependence on the core structure’s size and composition.
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A crystallographic data table, ellipsoid representations, and spectroscopic data are available free of charge as electronic supplementary information. CCDC 2027894-2027899 contain the supplementary crystallographic data for the compounds 1–6 respectively. These data can be obtained free of charge via http://www.ccdc.cam.ac.uk/conts/retrieving.html, or from the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: (+ 44) 1223–336–033; or e-mail: deposit@ccdc.cam.ac.uk.
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Acknowledgements
The authors are grateful for the financial support from the National Council for Scientific and Technological Development (Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq), the Commission for Improvement of Higher Education Personnel (Comissão de Aperfeiçoamento de Pessoal de Nível Superior—CAPES—Finance Code 001) via the CAPES-PrInt initiative, and the Rio Grande do Sul State Foundation for Research Support (Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul—FAPERGS). We also are grateful to the PROBRAL-CAPES/DAAD program (88881.144118/2017-01) which made possible the work together with the Freie Universität Berlin. F.D.S. gratefully acknowledges a scholarship from PPGQ/UFSM CAPES/PROEX program. S.S.S. gratefully acknowledges grants sponsored by FIPE/CCNE/UFSM projects. The X-ray diffractometer, the FT-IR, the Raman, and the UV-Vis spectrometers were purchased with funding from FINEP/CT-Infra.
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This work was funded by the National Council for Scientific and Technological Development (Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq) (Brazil), the Commission for Improvement of Higher Education Personnel (Comissão de Aperfeiçoamento de Pessoal de Nível Superior—CAPES) (Brazil), the Rio Grande do Sul State Foundation for Research Support (Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul—FAPERGS), and the German Academic Exchange Service (Deustcher Akademischer Austauschdienst—DAAD) (Germany).
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FDS: Investigation, Validation, Formal analysis, Writing—Original Draft; ALH: Investigation, Validation; RAB: Formal analysis, Writing—Review & Editing, UA: Funding acquisition, Resources, Writing—Review & Editing, Project administration; ESL: Funding acquisition, Resources, Writing—Review & Editing, Project administration; SSS: Funding acquisition, Supervision, Resources, Methodology, Conceptualization, Writing—Original Draft, Writing—Review & Editing.
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da Silva, F.D., Hennemann, A.L., Burrow, R.A. et al. Bis(2-pyridyl)ditellane as a Precursor for [HgTe]-Based Clusters and Zwitterionic Compounds. J Clust Sci 33, 815–824 (2022). https://doi.org/10.1007/s10876-021-02128-y
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DOI: https://doi.org/10.1007/s10876-021-02128-y