Two New Antimony(III) Chloride Hybrids Composed of Mononuclear [SbCl6]3- Unit and Ionic Liquid Cations with Different Length of Alkyl Chain

Two new hybrid chloroantimonates, namely, [Prmim]3SbCl6 (1, Prmim = 1-propyl-3-methylimidazolium) and [Hmim](3)SbCl6 (2, Hmim = 1-hexyl-3-methylimidazolium), were synthesized in ionic liquids (ILs) with the yields of 97% and 72%, respectively. Single-crystal X-ray diffraction (SCXRD) study reveals that 1 crystallizes in monoclinic, space group Pn with a = 15.2988(12), b = 13.6388(10), c = 15.6761(13) angstrom, beta = 98.677(7)degrees, V = 3233.5(4) angstrom(3), Z = 4, D-c = 1.459 g.cm(-3), F(000) = 1440, mu = 1.370 mm(-1), R = 0.0589 and wR = 0.1366 (I > 2 sigma(I)); 2 crystallizes in the hexagonal space group of P6(3) with a = 27.7471(6), b = 27.7471(6), c = 8.9811(2) angstrom, V = 5988.2(3) angstrom(3), Z = 6, D-c = 1.391 g.cm(-3), F(000) = 2592, mu = 1.121 mm(-1), R = 0.0420 and wR = 0.0726 (I > 2 sigma(I)). The photophysical properties of the title compounds were studied by solid-state optical absorption, photoluminescent excitation/emission (PLE/PL), PL decay spectra and photoluminescent quantum yield (PLQY). 1 and 2 exhibit PL peaks at 627 and 607 nm, Stokes shifts of 257 and 242 nm, and PLQY of 32.5% and 49.2%, respectively. The distinct photo physical characteristics of 1 and 2 are highly related to the distortion extent of the [SbCl6](3-)unit.

Automated summary

Two new hybrid chloroantimonates, [Prmim]3SbCl6 and [Hmim]3SbCl6, were synthesized in ionic liquids with different crystalline structures. Their photophysical properties, including emission peaks and quantum yields, were investigated, revealing distinct characteristics associated with the distortion extent of the [SbCl6]3- unit.