重鉻酸銫

重鉻酸銫
英文名	cesium dichromate
識別
CAS號	13530-67-1
PubChem	3084158
SMILES	[Cs+].[Cs+].[O-][Cr](=O)(=O)O[Cr](=O)(=O)[O-];
性質
化學式	Cs2Cr2O7
熔點	384 °C（657 K）
沸點	600 °C（873 K）（分解）
溶解性（水）	g/100 g水：; 0.09（0 °C）, 3.6（25 °C）,; 8.03（40 °C）, 22.6（60 °C）
相關物質
其他陽離子	重鉻酸鉀、重鉻酸鈉
	若非註明，所有數據均出自標準狀態（25 ℃，100 kPa）下。

重鉻酸銫是一種無機化合物，化學式為Cs₂Cr₂O₇。

製備

重鉻酸銫可由重鉻酸鈉和氯化銫或硫酸銫在70~80 °C混合，冷卻後過濾沉澱，洗滌、重結晶得到。^[2]它也可由碳酸銫和三氧化鉻反應製得：^[3]

Cs₂CO₃ + 2 CrO₃ → Cs₂Cr₂O₇ + CO₂↑

性質

重鉻酸銫可以和疊氮化鋇反應，得到疊氮化銫。^[4]它和三氟化溴反應，可以得到CsCrOF₄。^[5]它和五氧化二釩在430-550 °C反應，可以得到CsCrV₂O₇：^[6]

2 Cs₂Cr₂O₇ + 4 V₂O₅ → 4 CsCrV₂O₇ + 3 O₂↑

它和草酸、草酸銫在溶液中混合，緩慢揮發溶劑可以結晶出暗藍色的Cs₃[Cr(C₂O₄)₃]·2H₂O。^[7]

參考文獻

^ ^1.0 ^1.1 ^1.2 Properties of substance: cesium dichromate. chemister.ru. [2020-12-11].
^ Shakhno, I. V.; Plyushchev, V. E. Synthesis of rubidium and cesium dichromate. Khimicheskaya Nauka i Promyshlennost, 1959. 4: 685-686. ISSN: 0368-5586.
^ Vinarov, I. V.; Fraiman, I. B.; Kolach, S. A. Complex preparation of reactive pure cesium salts from cesium chloride. Khimicheskaya Tekhnologiya (Kharkov), 1966. 6. 98-102. ISSN: 0368-699X.
^ Csaszar, Lili M.; Rozsa, Karoly. Convenient method for producing small quantities of Cs metal. KFKI (Kozp. Fiz. Kut. Int.) Koezlemeny, 1964. 12 (2): 175-179. CAN61: 82196.
^ Eric G. Hope, Peter J. Jones, William Levason, J. Steven Ogden, Mahmoud Tajik, Jeremy W. Turff. Synthesis and properties of chromium(V) trifluoride oxide CrOF3 and related oxo-anions. Journal of the Chemical Society, Dalton Transactions. 1984, (11): 2445 [2020-12-11]. ISSN 0300-9246. doi:10.1039/dt9840002445 （英語）.
^ Yonggang Wang, Jie Liang, Ting Wen, Kuo Li, Yingxia Wang, Guobao Li, Fuhui Liao, Jianhua Lin. Syntheses and properties of a series of chromium vanadates ACrV2O7 (A=Na, K, Rb, Cs) with layered structure. Journal of Solid State Chemistry. 2012-08, 192: 1–6 [2020-12-11]. doi:10.1016/j.jssc.2012.03.025. （原始內容存檔於2018-07-03）（英語）.
^ Lee Martin, Anthony Christian, Hiroki Akutsu. Tricaesium tris(oxalato-κ 2 O 1 , O 2 )chromate(III) dihydrate. Acta Crystallographica Section C Crystal Structure Communications. 2010-06-15, 66 (6): m157–m159 [2020-12-11]. ISSN 0108-2701. doi:10.1107/S0108270110014861. （原始內容存檔於2020-02-20）.

[chem-1] 1.0 ^1.1 ^1.2 Properties of substance: cesium dichromate. chemister.ru. [2020-12-11].

[2] Shakhno, I. V.; Plyushchev, V. E. Synthesis of rubidium and cesium dichromate. Khimicheskaya Nauka i Promyshlennost, 1959. 4: 685-686. ISSN: 0368-5586.

[3] Vinarov, I. V.; Fraiman, I. B.; Kolach, S. A. Complex preparation of reactive pure cesium salts from cesium chloride. Khimicheskaya Tekhnologiya (Kharkov), 1966. 6. 98-102. ISSN: 0368-699X.

[4] Csaszar, Lili M.; Rozsa, Karoly. Convenient method for producing small quantities of Cs metal. KFKI (Kozp. Fiz. Kut. Int.) Koezlemeny, 1964. 12 (2): 175-179. CAN61: 82196.

[5] Eric G. Hope, Peter J. Jones, William Levason, J. Steven Ogden, Mahmoud Tajik, Jeremy W. Turff. Synthesis and properties of chromium(V) trifluoride oxide CrOF3 and related oxo-anions. Journal of the Chemical Society, Dalton Transactions. 1984, (11): 2445 [2020-12-11]. ISSN 0300-9246. doi:10.1039/dt9840002445 （英語）.

[6] Yonggang Wang, Jie Liang, Ting Wen, Kuo Li, Yingxia Wang, Guobao Li, Fuhui Liao, Jianhua Lin. Syntheses and properties of a series of chromium vanadates ACrV2O7 (A=Na, K, Rb, Cs) with layered structure. Journal of Solid State Chemistry. 2012-08, 192: 1–6 [2020-12-11]. doi:10.1016/j.jssc.2012.03.025. （原始內容存檔於2018-07-03）（英語）.

[7] Lee Martin, Anthony Christian, Hiroki Akutsu. Tricaesium tris(oxalato-κ 2 O 1 , O 2 )chromate(III) dihydrate. Acta Crystallographica Section C Crystal Structure Communications. 2010-06-15, 66 (6): m157–m159 [2020-12-11]. ISSN 0108-2701. doi:10.1107/S0108270110014861. （原始內容存檔於2020-02-20）.

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