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Transparent, dark orange Ba[Au(N3)4]2 ⋅ 4 H2O 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 H2O 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 FROM AUTHOR]

Cover Feature: The First Alkaline-Earth Azidoaurate(III), Ba[Au(N3)4]2 - 4 H2O (Chem. Eur. J. 11/2023) Alkaline-earth metals, azides, crystal structures, gold, vibrational spectroscopy Keywords: alkaline-earth metals; azides; crystal structures; gold; vibrational spectroscopy EN alkaline-earth metals azides crystal structures gold vibrational spectroscopy 1 1 1 02/23/23 20230221 NES 230221 B Dark orange and highly explosive b : The cover figure displays the structure of cation-poor Ba[Au-(N SB 3 sb ) SB 4 sb ] SB 2 sb B - b 4 H SB 2 sb O, containing tetraazidoaurate(III)anions with a novel geometry and gold in a square-planar coordination of nitrogen. [Extracted from the article]

Transparent, dark orange Ba[Au(N 3 ) 4 ] 2  ⋅ 4 H 2 O was synthesized by reaction of Ba(N 3 ) 2 and AuCl 3 or HAuCl 4 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(N 3 ) 4 ] 2  ⋅ 4 H 2 O are two crystallographically independent discrete anions [Au(N 3 ) 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., (© 2022 The Authors. Chemistry - A European Journal published by Wiley-VCH GmbH.)