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Q 18 Mg 6 (B 5 O 10 ) 3 (B 7 O 14 ) 2 F (Q=Rb and Cs): New Borates Containing Two Large Isolated Polyborate Anions with Similar Topological Structures
Author(s) -
Wang Zheng,
Zhang Min,
Su Xin,
Pan Shilie,
Yang Zhihua,
Zhang Hui,
Liu Lu
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201404738
Subject(s) - boron , crystallography , tetrahedron , chemistry , group (periodic table) , series (stratigraphy) , inorganic chemistry , geology , organic chemistry , paleontology
Two novel isomorphic borates, Q 18 Mg 6 (B 5 O 10 ) 3 (B 7 O 14 ) 2 F (Q=Rb and Cs), were synthesized from high‐temperature solutions. These borates are created from two kinds of isolated polyborate anionic groups, [B 5 O 10 ] and [B 7 O 14 ], and are further examples of two kinds of isolated polyborate anions coexisting in one borate structure. Although the title compounds are new structures, they are similar to the structures of the KBe 2 BO 3 F 2 (KBBF) series of compounds, for example, Na 2 Be 4 B 4 O 11 and γ‐KBe 2 B 3 O 7 , which can be regarded as the substitution of [BO 3 ] and [B 2 O 5 ]/[B 3 O 6 ] groups with [B 7 O 14 ] and [B 5 O 10 ] groups, respectively. It is found that the coexisting BO groups tend to have similar structures. Also, the isolation of [B 5 O 10 ] and [B 7 O 14 ] in the title compounds mainly derives from the special role of magnesium tetrahedra, which has a similar role to that of the BeO 4 tetrahedra in the KBBF series compounds. Electron‐density maps and bond‐overlap population (BOP) were calculated to illustrate this feature.