Tetrahydroxozincate Explained

In chemistry, tetrahydroxozincate or tetrahydroxidozincate is a divalent anion (negative ion) with formula, with a central zinc atom in the +2 or (II) valence state coordinated to four hydroxide groups. It has Sp3 hybridization. It is the most common of the zincate anions, and is often called just zincate.

These names are also used for the salts containing that anion, such as sodium zincate Na₂Zn(OH)₄ and calcium zincate CaZn(OH)₄·2H₂O

Zincate salts can be obtained by reaction of zinc oxide (ZnO) or zinc hydroxide and a strong base like sodium hydroxide.

It is now generally accepted that the resulting solutions contain the tetrahydroxozincate ion. Earlier Raman studies had been interpreted as indicating the existence of linear ions.

Related anions and salts

The name "zincate" may also refer to a polymeric anion with formula approaching [{{chem|Zn(OH)|3|-}}]_n, which forms salts such as ·, or to mixed oxides of zinc and less electronegative elements, such as .

See also

• tetrachlorozincate or tetrachloridozincate,
• tetranitratozincate,

References

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Notes and References

1. D. Trinschek . M. Jansen . Na₂ZnO₂, ein neues Natriumzinkat . . 51 b . 1996 . 711–4. 10.1515/znb-1996-0515 . 96961116 . free .
2. Synthese und Kristallstruktur von NaZn(OH)₃·H₂O und NaZn(OH)₃ . R. Stahl . H. Jacobs . . 624 . 1 . 25–29 . 10.1002/(SICI)1521-3749(199801)624:1<25::AID-ZAAC25>3.0.CO;2-8 . 1998.
3. 10.1002/(SICI)1521-3749(199901)625:1<48::AID-ZAAC48>3.0.CO;2-L . Synthese und Kristallstruktur von Na₂Zn(OH)₄ . 1999 . Stahl, R. . Zeitschrift für anorganische und allgemeine Chemie . 625 . 48–50 . Niewa . R. . Jacobs . H..
4. 10.1063/1.1679405 . Raman study of aqueous zinc oxide–alkali metal hydroxide system . 1973 . Sharma, Shiv Kumar . The Journal of Chemical Physics . 58 . 1626–1629 . 4. 1973JChPh..58.1626S .
5. 10.1149/1.2108376 . Physico-Chemical Properties of Calcium Zincate . 1986 . Sharma, Ram A. . Journal of the Electrochemical Society . 133 . 2215–2219 . 11. 1986JElS..133.2215S .
6. 10.1021/j100031a026 . EXAFS Investigations of Zn(II) in Concentrated Aqueous Hydroxide Solutions . 1995 . Kaumudi I. Pandya . Andrea E. Russell . J. Mc Breen . W. E. O' Grady . The Journal of Physical Chemistry . 99 . 11967 . 31.
7. [IUPAC nomenclature of inorganic chemistry 2005]