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Cs4 B4 O3 F10 : First Fluorooxoborate with [BF4 ] Involving Heteroanionic Units and Extremely Low Melting Point
Ming Xia1,2, Miriding Mutailipu1,2, Fuming Li1,2
1CAS Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi, 830011, P.R. China.
Abstract:
Herein, a new congruently melting mixed-anion compound Cs4 B4 O3 F10 has been characterized as the first fluorooxoborate with [BF4 ] involving heteroanionic units. Compound Cs4 B4 O3 F10 possesses two highly fluorinated anionic clusters and therefore its formula can be expressed as Cs3 (B3 O3 F6 ) ⋅ Cs(BF4 ). The influence of [BF4 ] units on micro-symmetry and structural evolution was discussed based on the parent compound. More importantly, Cs4 B4 O3 F10 shows the lowest melting point among all the available borates and thus sets a new record for such system. This work is of great significance to enrich and tailor the structure of borates using perfluorinated [BF4 ] units.
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