New Ionic Liquid Compounds Based on Tantalum Pentachloride TaCl 5 : Synthesis, Structural, and Spectroscopic Elucidation of the (μ‐Oxido)‐Chloridotantalates(V) [BMPy][TaCl 6 ], [BMPy] 4 [(TaCl 6 ) 2 (Ta 2 OCl 10 )], and [EMIm] 2 [Ta 2 OCl 10 ]

1‐Butyl‐4‐methylpyridinium hexachloridotantalate(V), [BMPy][TaCl 6 ] ( 1 ), tetrakis(1‐butyl‐4‐methylpyridinium) bis(hexachloridotantalate(V) (μ‐oxido)‐decachloridotantalate(V), [BMPy] 4 [(TaCl 6 ) 2 (Ta 2 OCl 10 )] ( 2 ), and bis(1‐ethyl‐3‐methylimidazolium)‐(μ‐oxido)‐decachloridoditantalate(V), [EMIm] 2 [Ta 2 OCl 10 ] ( 3 ) were synthesized and characterized by single‐crystal X‐ray diffraction and vibrational spectroscopy. Compounds 1 and 3 crystallize in the monoclinic space group P 2 1 / c (no. 14), whereas compound 2 crystallizes in the triclinic space group P $\bar{1}$ (no. 2). All compounds are built up by the mentioned bulky organic cations and octahedral [TaCl 6 ] – respective linear [Ta 2 OCl 10 ] 2– anions. Coulomb interactions are dominant between the ionic species. FT‐IR and FT‐Raman spectra were recorded and interpreted, especially with respect to the inorganic species [TaCl 6 ] – ( O h ) and [Ta 2 OCl 10 ] 2– ( C i symmetry, approximately D 4 h ). The melting temperatures of compounds 1 – 3 are given.