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Characterisation of Four New Two‐Dimensional Lithium Beryllofluoro‐Layered Compounds
Author(s) -
Gerrard Lee A.,
Weller Mark T.
Publication year - 2003
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.200304991
Subject(s) - monoclinic crystal system , orthorhombic crystal system , amine gas treating , lithium (medication) , crystallography , chemistry , protonation , hydrothermal circulation , stoichiometry , ethylamine , ion , hydrothermal synthesis , hydrogen bond , propylamine , inorganic chemistry , crystal structure , molecule , organic chemistry , chemical engineering , medicine , engineering , endocrinology
Abstract Four new amine‐templated materials, containing two‐dimensional lithium beryllofluoride sheets of the stoichiometry [LiBeF 4 ] − , have been synthesised under hydrothermal and ambient pressure conditions. [LiBeF 4 ][C 6 H 4 (CH 3 )CH 2 NH 3 ] ( 1 ), [LiBeF 4 ][C 6 H 4 CH 2 NH 3 Cl] ( 2 ), [LiBeF 4 ] 2 [NH 3 CH 2 CH 2 CH 2 NH 3 ] ( 3 ), and [LiBeF 4 ][C 6 H 5 CH 2 CH 2 CH 2 NH 3 ] ( 4 ) all contain well‐separated anionic sheets containing two different topologies with the ′inter‐layer′ regions comprising of organoamine templating species. Use of the different organoamine templating agents results in compounds possessing very different relative arrangements of the lithium beryllofluoride sheets. The materials crystallise in P‐centred orthorhombic and monoclinic cells; for 1 (templating agent: 3‐methylbenzylamine) P ca 2 1 ; for 2 (4‐chlorobenzylamine) P bca ; for 3 (1,3‐diamminopropane) P ccn , and for 4 (3‐phenyl‐1‐propylamine) P2 1 / c. Hydrogen bonding exists between ions situated on the protonated amine groups on the templating species and electronegative fluoride ions, on MF 4 tetrahedra (where M=Li and Be).