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Rare‐Earth Metal Tetracyanidoborate Hydrate Salts: Structural, Spectral, and Thermal Properties as well as the Luminescence of Dehydrated Salts
Author(s) -
Falk Fanni,
Hackbarth Liisa,
Lochbrunner Stefan,
Marciniak Henning,
Küppers Torsten,
Köckerling Martin
Publication year - 2018
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201800089
Subject(s) - isostructural , luminescence , hydrate , metal , chemistry , thermal decomposition , inorganic chemistry , salt (chemistry) , molecule , lanthanide , rare earth , ion , crystallography , crystal structure , materials science , mineralogy , organic chemistry , optoelectronics
New tetracyanidoborate salts with hydrated rare‐earth metal cations ( RE 3+ ) were obtained by the reaction of rare‐earth metal oxides or hydroxides with tetracyanidoboronic acid. A group of isostructural compounds was obtained, which has the chemical formula [ RE {B(CN) 4 } 3 (H 2 O) 5 ] · n H 2 O ( RE = La, Ce, Pr, Nd, Sm, Eu, and Gd; n ≤ 0.5). In all compounds the rare‐earth metal cations have the coordination number nine with a RE ‐O 5 N 4 environment. They are connected to chains through one bridging tetracyanidoborate anion per RE 3+ cation, according to [ RE {μ‐B(CN) 4 }{κN‐B(CN) 4 } 2 (H 2 O) 5 ] · n H 2 O. Solid samples of the Eu salt show luminescence with intense lines in the excitation and emission spectra caused by electronic transitions within the f and d shells.Thermal investigations indicate that all water molecules but one can be removed at temperatures below 160 °C and the last one by heating up to 340 °C. On further heating decomposition is observed.