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• W1976593586 abstract "Three novel quaternary selenoarsenates could be synthesized by the solventothermal reaction of [AsSe3]3- anions with AgBF4 in the presence of the respective alkali metal cation. Orange crystals of K3AgAs2Se5·0.25MeOH (I) are formed after reaction in MeOH at 130 °C for ∼2 h. Its structure is built up of ψ-bitetrahedral [As2Se5]4- units, which are connected by Ag+ ions to form anionic one-dimensional chains. These chains are separated from each other by the K+ cations. Longer reaction time, i.e., 3 days, at the same temperature provides red crystals of K2AgAs3Se6 (II) and, correspondingly, the isostructural Rb2AgAs3Se6 (III), which possess two-dimensional (2D) polyanions [AgAs3Se6]2-. They consist of double layers of strongly waved, infinite [AsSe2]- chains, which are interconnected by tetrahedral Ag+ ions. The structure can also be described as [Ag2As6Se14]8- cores, which are connected by bridging Se atoms to build the sheet anion. Both II and III possess Ag2Se2 four-membered rings, which lead to Ag···Ag distances between 3 and 3.3 Å. The thermal, optical, and spectroscopic properties of the compounds are reported. They melt incongruently between 259 and 284 °C and are wide band gap semiconductors with values between 1.9 and 2.1 eV. Raman spectroscopic data show typical patterns for the respective selenoarsenate anionic building units in the range 100−300 cm-1. Crystal data: K3AgAs2Se5·0.25MeOH (I), monoclinic, P21/c, a = 9.229(1) Å, b = 11.508(2) Å, c = 12.905(2) Å, β = 104.272(2)°, Z = 4; K2AgAs3Se6 (II), monoclinic, P21/n, a = 12.5994(6) Å, b = 7.4980(4) Å, c = 14.2648(7) Å, β = 96.625(2)°, Z = 4; Rb2AgAs3Se6 (III), monoclinic, P21/n, a = 12.717(2) Å, b = 7.7329(8) Å, c = 14.368(2) Å, β = 95.745(2)°, Z = 4." @default.
• W1976593586 created "2016-06-24" @default.
• W1976593586 creator A5035758112 @default.
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• W1976593586 date "1999-08-01" @default.
• W1976593586 modified "2023-10-16" @default.
• W1976593586 title "Condensation of Pyramidal [AsSe₃]³^- Anions for the Construction of Polymeric Networks: Solventothermal Synthesis of K₃AgAs₂Se₅·0.25MeOH, K₂AgAs₃Se₆, and Rb₂AgAs₃Se₆" @default.
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• W1976593586 doi "https://doi.org/10.1021/ic990274r" @default.
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