P-T phase diagram and gold valence state of new gold mixed-valence complexes, Cs2[AuIX2][AuIIIY4](X, Y = Cl, Br, I; X ≠ Y)

Content Provider	Semantic Scholar
Author	Ikeda, Kazuhiro Ono, Yoshiaki Enomoto, Masaya Kojima, N. Kobayashi, Yasuhiro Seto, Makoto Koyama, Kazuko Uwatoko, Yoshiya
Copyright Year	2004
Abstract	Cs 2 [Au I X 2 ][Au I I I X 4 ](X = Cl, Br, and I) is well known for the perovskite-type gold mixed-valence system. This system undergoes pressure-induced and photo-induced Au valence transition from the mixed valence state ofAu I , I I I to the single valence state of Au I I . Recently, we have succeeded in synthesizing new gold mixed-valence complexes having perovskite-type structure, Cs 2 [Au I X 2 ][Au I I I Y 4 ](X, Y = halogen, X = Y), in organic solvent by using a new method. This hetero-halogen bridged gold mixed-valence system was confirmed by means of Raman spectroscopy From the analysis of 1 9 7 Au Mossbauer spectra, it was elucidated that the charge transfer interaction between Au I (5d x 2 - y 2) and Au I I I (5d x 2 - y 2)in the a-b plane becomes dominant for the Au I -Au I I I interaction in Cs 2 [Au I X 2 ][Au I I I Y 4 ] (X, Y = Cl, Br, and I) in the order of X = Cl < Br < I, where Y is fixed. In order to elucidate the Au valence transition for Cs 2 [Au I X 2 ][Au I I I Y 4 ], we have investigated the X-ray diffraction and Raman spectra under high pressure. Moreover, we have synthesized TlAuX 3 (X= Cl and Br) having cubic perovskite structure and highly conducting behavior. The Au valence state in TlAuX 3 is considered to be Au" at ambient pressure.
Starting Page	159
Ending Page	164
Page Count	6
File Format	PDF HTM / HTML
Volume Number	48
Alternate Webpage(s)	https://www.irsm.cas.cz/materialy/cs_content/2004/Ikeda_CS_2004_0000.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article