九氫合錸(VII)酸鈉 是一種過渡金屬氫負離子配合物，化學式為Na2 [ReH9 ]。[ 2] [ 3]
金屬鈉還原高錸酸鈉 或高錸酸銨 的乙醇 溶液可以得到。[ 4]
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{\displaystyle {\mathsf {NH_{4}ReO_{4}+18Na+13C_{2}H_{5}OH\ {\xrightarrow {}}\ Na_{2}[ReH_{9}]\downarrow +13C_{2}H_{5}ONa+3NaOH+NH_{3}\cdot H_{2}O}}}
Na2 [ReH9 ]可溶於水 和甲醇 ，微溶於乙醇。[ 4]
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{\displaystyle {\mathsf {2Na_{2}[ReH_{9}]\ {\xrightarrow {245^{o}C}}\ 4NaH+2Re+7H_{2}}}}
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{\displaystyle {\mathsf {Na_{2}[ReH_{9}]+5H_{2}O\ {\xrightarrow {100^{o}C}}\ NaReO_{4}+NaOH+9H_{2}}}}
Na2 [ReH9 ]在鹼性溶液中穩定，和稀酸反應放出氫氣 ：[ 4]
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{\displaystyle {\mathsf {2Na_{2}[ReH_{9}]+4HCl\ {\xrightarrow {}}\ 4NaCl+2Re\downarrow +11H_{2}\uparrow }}}
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{\displaystyle {\mathsf {4Na_{2}[ReH_{9}]+22HNO_{3}\ {\xrightarrow {100^{o}C}}\ 4NaReO_{4}+9NH_{4}NO_{3}+4NaNO_{3}+11H_{2}O}}}
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{\displaystyle {\mathsf {Na_{2}[ReH_{9}]+9H_{2}O_{2}\ {\xrightarrow {100^{o}C}}\ NaReO_{4}+NaOH+13H_{2}O}}}
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{\displaystyle {\mathsf {4Na_{2}[ReH_{9}]+11O_{2}\ {\xrightarrow {\tau }}\ 4Re+8NaOH+14H_{2}O}}}
^ A. P. Ginsberg, C. R. Sprinkle. Transition metal-hydrogen compounds. IV. Improved synthesis of enneahydridorhenates: the sodium and tetraethylammonium salts of ReH9 2- . Inorg. Chem., 1969, 8 (10), pp 2212–2214. DOI: 10.1021/ic50080a037
^ Лидин Р.А. и др. Химические свойства неорганических веществ: Учеб. пособие для вузов. — 3-е изд., испр. — М.: Химия, 2000. — 480 с. — ISBN 5-7245-1163-0 .
^ Рипан Р., Четяну И. Неорганическая химия. Химия металлов. — М.: Мир, 1972. — Т. 2. — 871 с.
^ 4.0 4.1 4.2 朱文祥. 無機化合物製備手冊. 化學工業出版社. pp 312-314. 【VII-74】九氫合錸酸二鈉（sodium nonahydridorhenate）
Cotton F A. Nonahydridorhenate Salts[M]// Inorganic Syntheses, Volume 13. John Wiley & Sons, Inc. 2007:219-225. 
![{\displaystyle {\mathsf {NH_{4}ReO_{4}+18Na+13C_{2}H_{5}OH\ {\xrightarrow {}}\ Na_{2}[ReH_{9}]\downarrow +13C_{2}H_{5}ONa+3NaOH+NH_{3}\cdot H_{2}O}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/7969508e90e2f1ce0c49465db090a386dc63150d)
![{\displaystyle {\mathsf {2Na_{2}[ReH_{9}]\ {\xrightarrow {245^{o}C}}\ 4NaH+2Re+7H_{2}}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/3471127989dfc39457c59db2db70221d59097c88)
![{\displaystyle {\mathsf {Na_{2}[ReH_{9}]+5H_{2}O\ {\xrightarrow {100^{o}C}}\ NaReO_{4}+NaOH+9H_{2}}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/734ec6f924d1134a50c00b69578042cbf6ac8d65)
![{\displaystyle {\mathsf {2Na_{2}[ReH_{9}]+4HCl\ {\xrightarrow {}}\ 4NaCl+2Re\downarrow +11H_{2}\uparrow }}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/2731f5297f7422dc8b56cc35c078acf414269944)
![{\displaystyle {\mathsf {4Na_{2}[ReH_{9}]+22HNO_{3}\ {\xrightarrow {100^{o}C}}\ 4NaReO_{4}+9NH_{4}NO_{3}+4NaNO_{3}+11H_{2}O}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/f2bffcfbb16f41826e6cebf5b6043b7aedb0d8c7)
![{\displaystyle {\mathsf {Na_{2}[ReH_{9}]+9H_{2}O_{2}\ {\xrightarrow {100^{o}C}}\ NaReO_{4}+NaOH+13H_{2}O}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/b13ce49ac21159e8e6f5496e97b2bf25c08d78c0)
![{\displaystyle {\mathsf {4Na_{2}[ReH_{9}]+11O_{2}\ {\xrightarrow {\tau }}\ 4Re+8NaOH+14H_{2}O}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/a4481716db2048cbad5436042481e8faf4647a1b)