The First Alkaline‐Earth Azidoaurate(III), Ba[Au(N3)4]2 ⋅ 4 H2O. Issue 11 (17th January 2023)

• Record Type: Journal Article
• Authors: Subaşı, Yaprak; Tekin, Elif Sena; Prots, Yurii; Jach, Franziska; Somer, Mehmet; Afyon, Semih; Höhn, Peter
• Is Part Of: Chemistry. Volume 29:Issue 11(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-01-17
• Subjects: alkaline-earth metals -- azides -- crystal structures -- gold -- vibrational spectroscopy; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.202203501
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: Transparent, dark orange Ba[Au(N3 )4 ]2 ⋅ 4 H2 O was synthesized by reaction of Ba(N3 )2 and AuCl3 or HAuCl4 in aqueous solution. The novel barium tetraazidoaurate(III) tetrahydrate crystallizes in the monoclinic space group Cc (no. 9) with a =1813.68(17) pm, b =1737.95(11) pm, c =682.04(8) pm and β =108.849(4)°. The predominant structural features of Ba[Au(N3 )4 ]2 ⋅ 4 H2 O are two crystallographically independent discrete anions [Au(N3 )4 ] − with gold in a tetragonal planar coordination by nitrogen. Vibrational spectra show good agreement with those of other azidoaurates(III). Upon drying, this salt was shown to be a highly explosive material. Abstract : Square and planar, but novel and explosive : Cation‐poor Ba[Au(N3 )4 ]2 ⋅ 4 H2 O forms transparent, dark orange crystals. The highly sensitive compound contains tetraazidoaurate(III) anions with a novel geometry and gold in square‐planar coordination around nitrogen. Extensive vibrational spectroscopic investigations confirm both the anion geometry and the existence of hydrogen bonds.