Organic–Inorganic Hybrid Gold Halide Perovskites: Structural Diversity through Cation Size

Autor:	Hiroaki Iguchi, Shinya Takaishi, Hideaki Murasugi, Shohei Kumagai, Masahiro Yamashita
Rok vydání:	2019
Předmět:	chemistry.chemical_classification 010405 organic chemistry Band gap Organic Chemistry Gold halide Iodide General Chemistry Crystal structure 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences Coordination complex Crystallography chemistry.chemical_compound Formamidinium chemistry Pyridinium Triiodide
Zdroj:	Chemistry – A European Journal. 25:9885-9891
ISSN:	1521-3765 0947-6539
DOI:	10.1002/chem.201901288
Popis:	Crystal structures of a series of organic-inorganic hybrid gold iodide perovskites, formulated as A2 [AuI I2 ][AuIII I4 ] [A=methylammonium (MA) (1) and formamidinium (FA) (2)], A'2 [I3 ]1-x [AuI I2 ]x [AuIII I4 ] [A'=imidazolium (IMD) (3), guanidinium (GUA) (4), dimethylammonium (DMA) (5), pyridinium (PY) (6), and piperizinium (PIP) (7)], systematically changed depending on the cation size. In addition, triiodide (I3- ) ions were partly incorporated into the AuI2- sites of 3-7, whereas they were not incorporated into those of 1 and 2. Such a difference comes from the size of the organic cation. Optical absorption spectra showed characteristic intervalence charge-transfer bands from AuI to AuIII species, and the optical band gap increased as the size of the cation became larger.
Databáze:	OpenAIRE
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