Chemistry:Sodium maleonitriledithiolate

Sodium maleonitriledithiolate

Names
Preferred IUPAC name Disodium (Z)-1,2-dicyanoethene-1,2-bis(thiolate)
Other names Sodium mnt sodium maleonitriledithiolate
Identifiers
CAS Number	5466-54-6 Y
3D model (JSmol)	Interactive image
ChemSpider	5013443 Y
PubChem CID	6523934
InChI InChI=1S/C4H2N2S2.2Na/c5-1-3(7)4(8)2-6;;/h7-8H;;/q;2*+1/p-2/b4-3+;; Y Key: UIEQIOFOWZBELJ-CZEFNJPISA-L Y InChI=1/C4H2N2S2.2Na/c5-1-3(7)4(8)2-6;;/h7-8H;;/q;2*+1/p-2/b4-3+;; Key: UIEQIOFOWZBELJ-YWCBZGCUBZ
SMILES [Na+].[Na+].[S-]/C(C#N)=C(/[S-])C#N
Properties
Chemical formula	C4N2Na2S2
Molar mass	186.16 g·mol−1
Appearance	yellow solid
Solubility in ethanol, DMF	Soluble
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

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Sodium maleonitriledithiolate is the chemical compound described by the formula Na
2S
2C
2(CN)
2. The name refers to the cis compound, structurally related to maleonitrile ((CH(CN))
2). Maleonitriledithiolate is often abbreviated mnt. It is a "dithiolene", i.e. a chelating alkene-1,2-dithiolate. It is a prototypical non-innocent ligand in coordination chemistry. Several complexes are known, such as Ni(mnt)
2]²⁻.

Sample of ([(CH
3CH
2)
4N]+
)
2[Ni(mnt)
2]²⁻.

The salt is synthesized by treating carbon disulfide with sodium cyanide to give the cyanodithioformate salt, which eliminates elemental sulfur in aqueous solution:

8 NaCN + 8 CS
2 → 4 Na
2S
2C
2(CN)
2 + S
8

The compound was first described by Bähr and Schleitzer 1958.