Abstract
New polyselenidoarsenates [Co(dien)2]As2Se6, [Ni(dien)2]As2Se6 (dien = diethylenetriamine), and [Mn(dap)3]As2Se6 (dap = 1,2-diaminopropane) were synthesized by the reaction of As2O3, Se, and transition metal chloride in dien or dap solvent under solvothermal conditions. The compounds consist of a polyselenidoarsenate anion [As2Se6]2− and an octahedral complex cation [M(dien)2]2+ (M = Co, Ni) or [Mn(dap)3]2+. Two trigonal–pyramidal AsSe3 units are joined through two Se–Se bonds forming the dimeric [As2Se6]2− anion with a six-membered ring As2Se4 in chair conformation. In the crystal structures the anion and cations are connected into extended structures via weak N–H···Se hydrogen bonds. Thermogravimetric analyses show that the dien-containing compounds decompose in one step under nitrogen stream, whereas the Mn compound exhibits a two-step decomposition process.
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Acknowledgments
We are grateful to the National Natural Science Foundation of P. R. China (NSFC, No. 20771077), and the Key Laboratory of Organic Synthesis of Jiangsu Province, Soochow University financial support.
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Zhao, J., Liang, J., Pan, Y. et al. New polyselenidoarsenate salts with transition metal complexes as counterions: solvothermal synthesis, crystal structures, and properties of [M(dien)2]As2Se6 (M = Co, Ni) and [Mn(dap)3]As2Se6 . Monatsh Chem 142, 1203–1209 (2011). https://doi.org/10.1007/s00706-011-0561-z
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DOI: https://doi.org/10.1007/s00706-011-0561-z