硒氰

硒氰
別名	一氰化硒; 二氰化二硒
識別
CAS號	27151-67-3
性質
化學式	(SeCN)2
外觀	黃色晶體
溶解性	可溶於苯、三氯甲烷、四氯化碳
相關物質
其他陽離子	硫氰
相關化學品	硒氰酸鹽
	若非註明，所有數據均出自標準狀態（25 ℃，100 kPa）下。

硒氰是一種擬鹵素，化學式為(SeCN)₂。它可由硒氰酸銀和碘在乙醚中反應得到，其中86%的碘會轉化為碘化銀：^[2]

2 AgSeCN + I₂ ⇌ 2 AgI + (SeCN)₂

它在水中按下式水解：^[2]

2 (SeCN)₂ + 3 H₂O → H₂SeO₃ + 3 HSeCN + HCN

緩慢加熱硒氰，它可以歧化為二氰化硒（Se(CN)₂）和二硒氰酸硒（Se(SeCN)₂）。^[3]

它和三苯基膦反應，可以得到Ph₃P(SeCN)₂^[4]；和二羰基二茂鈦反應，羰基被取代，得到(C₅H₅)₂Ti(NCSe)₂；和二茂鉻或二茂釩反應，分別得到(C₅H₅)₂Cr(NCSe)(SeCN)和(C₅H₅)₂V(NCSe)₂。^[5]它和CN⁻在乙腈中反應，生成SeCN⁻和Se(CN)₂。^[6]

參考文獻

^ Birckenbach, Lothar; Kellermann, Karl. Pseudo halogens. I. Berichte der Deutschen Chemischen Gesellschaft [Abteilung] B: Abhandlungen, 1925. 58B: 786-794. ISSN: 0365-9488.
^ ^2.0 ^2.1 ^2.2 P. Walden, L. F. Audrieth. Free Inorganic Radicals.. Chemical Reviews. 1928-10-01, 5 (3): 339–359 [2021-01-04]. ISSN 0009-2665. doi:10.1021/cr60019a002 （英語）.
^ Colin J. Burchell, Petr Kilian, Alexandra M. Z. Slawin, J. Derek Woollins, Karla Tersago, Christian Van Alsenoy, Frank Blockhuys. E 2 (CN) 2 (E = S, Se) and Related Compounds. Inorganic Chemistry. 2006-01, 45 (2): 710–716 [2021-01-04]. ISSN 0020-1669. doi:10.1021/ic0515103 （英語）.
^ Y. Tamura, M. Adachi, T. Kawasaki, Y. Kita. Selenocyanation using a combined reagent of triphenylphosphine and selenocyanogen. A new and simple synthesis of alkyl selenocyanates and symmetrical alkyl diselenides from alcohols. Tetrahedron Letters. 1979-01, 20 (24): 2251–2252 [2021-01-04]. doi:10.1016/S0040-4039(01)93689-5 （英語）.
^ M. Morán, V. Fernández. Synthesis and characterization of mixed cyanothiocyanate and cyanoselenocyanate complexes of bis(cyclopentadienyl)-titanium, -vanadium and -chromium. Journal of Organometallic Chemistry. 1979-01, 165 (2): 215–223 [2021-01-04]. doi:10.1016/S0022-328X(00)94323-7. （原始內容存檔於2018-06-12）（英語）.
^ Austad, Tor. Reaction between dithio- or selenocyanide and the cyanide ion in acetonitrile. Study of the mechanism using ionic carbon-13 labeled cyanide. Acta Chemica Scandinavica, Series A: Physical and Inorganic Chemistry, 1974. 28 (7): 806-808. ISSN: 0302-4377.

[1] Birckenbach, Lothar; Kellermann, Karl. Pseudo halogens. I. Berichte der Deutschen Chemischen Gesellschaft [Abteilung] B: Abhandlungen, 1925. 58B: 786-794. ISSN: 0365-9488.

[Walden-2] 2.0 ^2.1 ^2.2 P. Walden, L. F. Audrieth. Free Inorganic Radicals.. Chemical Reviews. 1928-10-01, 5 (3): 339–359 [2021-01-04]. ISSN 0009-2665. doi:10.1021/cr60019a002 （英語）.

[3] Colin J. Burchell, Petr Kilian, Alexandra M. Z. Slawin, J. Derek Woollins, Karla Tersago, Christian Van Alsenoy, Frank Blockhuys. E 2 (CN) 2 (E = S, Se) and Related Compounds. Inorganic Chemistry. 2006-01, 45 (2): 710–716 [2021-01-04]. ISSN 0020-1669. doi:10.1021/ic0515103 （英語）.

[4] Y. Tamura, M. Adachi, T. Kawasaki, Y. Kita. Selenocyanation using a combined reagent of triphenylphosphine and selenocyanogen. A new and simple synthesis of alkyl selenocyanates and symmetrical alkyl diselenides from alcohols. Tetrahedron Letters. 1979-01, 20 (24): 2251–2252 [2021-01-04]. doi:10.1016/S0040-4039(01)93689-5 （英語）.

[5] M. Morán, V. Fernández. Synthesis and characterization of mixed cyanothiocyanate and cyanoselenocyanate complexes of bis(cyclopentadienyl)-titanium, -vanadium and -chromium. Journal of Organometallic Chemistry. 1979-01, 165 (2): 215–223 [2021-01-04]. doi:10.1016/S0022-328X(00)94323-7. （原始內容存檔於2018-06-12）（英語）.

[6] Austad, Tor. Reaction between dithio- or selenocyanide and the cyanide ion in acetonitrile. Study of the mechanism using ionic carbon-13 labeled cyanide. Acta Chemica Scandinavica, Series A: Physical and Inorganic Chemistry, 1974. 28 (7): 806-808. ISSN: 0302-4377.

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