| Identification | More | [Name]
7,7,8,8-Tetracyanoquinodimethane | [CAS]
1518-16-7 | [Synonyms]
1,4-BIS(DICYANOMETHYLENE)-2,5-CYCLOHEXADIENE
1,4-BIS(DICYANOMETHYLENE)CYCLOHEXADIENE
2,2'-(2,5-cyclohexadiene-1,4-diylidene)bispropanedinitrile
2,5-CYCLOHEXADIENE-1,4-DIYLIDENE-A,A'-DIMALONONITRILE
(2,5-CYCLOHEXADIENE-1,4-DIYLIDENE)DIMALONONITRILE
(2,5-CYCLOHEXADIENE-1,4-DIYLIDENE)MALONONITRILE
2,5-CYCLOHEXADIENE-DELTA1,ALPHA4,ALPHA'-DIMALONONITRILE
7,7,8,8-TETRACYANO-1,4-QUINODIMETHANE
7,7,8,8-TETRACYANOQUINODIMETHANE
TCNQ
TETRACYANODIMETHANOQUINONE
TETRACYANO P-QUINODIMETHANE
TETRACYANOQUINODIMETHANE
TIMTEC-BB SBB000435
2,2’-(2,5-cyclohexadiene-1,4-diylidene)bis-propanedinitril
2,5-Cyclohexadiene-1,4-diylidene-alpha,alpha'-dimalononitrile
2,5-cyclohexadiene-delta(sup1,alpha:4,alpha)-dimalononitrile
2,5-Cyclohexadiene-delta(sup1alpha:4alpha)dimalononitrile
7,7,8,8-Tetracyano-1,4-chinodimethan
7,7,8,8-Tetracyano-1,4-quinodimethan | [EINECS(EC#)]
216-174-8 | [Molecular Formula]
C12H4N4 | [MDL Number]
MFCD00011664 | [Molecular Weight]
204.19 | [MOL File]
1518-16-7.mol |
| Chemical Properties | Back Directory | [Appearance]
orange to green crystalline powder | [Melting point ]
287-289 °C (dec.) (lit.) | [Boiling point ]
332.67°C (rough estimate) | [density ]
1.3596 (rough estimate) | [refractive index ]
1.5000 (estimate) | [storage temp. ]
Sealed in dry,Room Temperature | [form ]
Crystalline Powder | [color ]
Orange-brown to green | [Stability:]
Stable. Incompatible with strong acids, strong bases, strong reducing agents, strong oxidizing agents. | [Water Solubility ]
insoluble | [semiconductor properties]
N-type (mobility=10-5cm2/V·s) | [λmax]
395nm(CH3CN)(lit.) | [BRN ]
611604 | [InChI]
InChI=1S/C12H4N4/c13-5-11(6-14)9-1-2-10(4-3-9)12(7-15)8-16/h1-4H | [InChIKey]
PCCVSPMFGIFTHU-UHFFFAOYSA-N | [SMILES]
C1(=C(C#N)C#N)C=CC(=C(C#N)C#N)C=C1 |c:8,t:0| | [CAS DataBase Reference]
1518-16-7(CAS DataBase Reference) | [NIST Chemistry Reference]
Propanedinitrile, 2,2'-(2,5-cyclohexadiene-1,4-diylidene)bis-(1518-16-7) | [EPA Substance Registry System]
1518-16-7(EPA Substance) | [Odor]
Dark yellow to brown crystals/powder |
| Hazard Information | Back Directory | [Description]
7,7,8,8-tetracyanoquinodimethane (TCNQ), with a LUMO at 4.5 eV, is known for the charge-transfer salts formed by its radical anion TCNQ in?photovoltaic, light-emitting diodes, and organic field-effect transistor?devices. TCNQ and its derivatives?have been used as dopants, leading to an increase in hole mobility or to the lowering of injection?barriers. One classic example of such is the treatment of tetrathiafulvene (TTF), an electron donor with TCNQ. TFF and TCNQ form an ion pair, the TTF-TCNQ complex. This process of doping leads to the crystallisation of the ion pair into a one-dimensionally stacked polymer. This polymer consists of segregated stacks of cations and anions of the donors and the acceptors, respectively. The complex crystal is an organic semiconductor that exhibits metallic electric conductivity [1, 2]. | [Chemical Properties]
orange to green crystalline powder | [History]
The first report on the electrical conductivity in an organic solid appeared in 1954, namely, a perylene—bromine complex with a room-temperature conductivity of 0.1 S cm?1. In 1960, the organic acceptor Tetracyanoquinodimethane (TCNQ; 7,7,8,8-Tetracyanoquinodimethane) was synthesized, as well as a great number of its conducting charge-transfer complexes and radical ion salts. In the 1970s, the organic donor TTF led to the first organic metal TTF-TCNQ. Its room-temperature conductivity (500 S cm?1) increases with a decrease in the temperature to the value of 6000 S cm?1 at 60 K, where a metal-insulator transition occurs[1].
| [Uses]
7,7,8,8-Tetracyanoquinodimethane is an electron-acceptor molecule used to form charge-transfer superconductors. It is an effective catalyst used for the ?-chlorination of carboxylic acids using chlorosulfonic acid; the presence of TCNQ suppresses competing free-radical chlorination. | [Definition]
ChEBI: A quinodimethane that is p-quinodimethane in which the methylidene hydrogens are replaced by cyano groups. | [Synthesis Reference(s)]
Journal of the American Chemical Society, 84, p. 3370, 1962 DOI: 10.1021/ja00876a028
The Journal of Organic Chemistry, 48, p. 1366, 1983 DOI: 10.1021/jo00156a048 | [General Description]
7,7,8,8-Tetracyanoquinodimethane (TNCQ) is a strong electron acceptor as it has four cyano groups and π-conjugation bonds that form charge transferring chains and ion radical salts which are mainly used as p-dopants for the fabrication of a variety of semiconductor applications. | [References]
[1] Tahar Abbaz. “Synthesis and electrochemical proprieties of novel unsymmetrical bis-tetrathiafulvalenes and electrical conductivity of their charge transfer complexes with tetracyanoquinodimethane (TCNQ).” International Journal of Molecular Sciences 13 7 (2012): 7872–7885.
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| Safety Data | Back Directory | [Hazard Codes ]
Xn,Xi | [Risk Statements ]
R22:Harmful if swallowed.
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed . | [Safety Statements ]
S22:Do not breathe dust .
S24/25:Avoid contact with skin and eyes .
S36/37:Wear suitable protective clothing and gloves .
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36:Wear suitable protective clothing . | [RIDADR ]
3276 | [WGK Germany ]
3
| [RTECS ]
GU4850000
| [Hazard Note ]
Irritant | [TSCA ]
Yes | [HazardClass ]
6.1 | [PackingGroup ]
II | [HS Code ]
29269095 |
| Questions And Answer | Back Directory | [Applications]
7,7,8,8-tetracyanoquinodimethane (TCNQ), with a LUMO at 4.5 eV, is known for the charge-transfer salts formed by its radical anion TCNQ in photovoltaic, light-emitting diodes, and organic field-effect transistor devices. TCNQ and its derivatives have been used as dopants, leading to an increase in hole mobility or to the lowering of injection barriers. One classic example of such is the treatment of tetrathiafulvene (TTF), an electron donor with TCNQ. TFF and TCNQ form an ion pair, the TTF-TCNQ complex. This process of doping leads to the crystallisation of the ion pair into a one-dimensionally stacked polymer. This polymer consists of segregated stacks of cations and anions of the donors and the acceptors, respectively. The complex crystal is an organic semiconductor that exhibits metallic electric conductivity.
It also has been shown that TCNQ can effectively modify Cu or Ag surfaces. The formation of Cu-TCNQ and Ag-TCNQ enhances the work function of such electrodes and reduces the hole injection barrier dramatically. Furthermore, it improves electrode/organic layer contact, hence the reduction of contact resistances.
Tetracyanoquinodimethane (TCNQ) is also found to act as a p-type doping agent of graphene films due to its powerful electron-accepting capacity.
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| Spectrum Detail | Back Directory | [Spectrum Detail]
7,7,8,8-Tetracyanoquinodimethane(1518-16-7)MS
7,7,8,8-Tetracyanoquinodimethane(1518-16-7)IR1
7,7,8,8-Tetracyanoquinodimethane(1518-16-7)IR2
7,7,8,8-Tetracyanoquinodimethane(1518-16-7)Raman
7,7,8,8-Tetracyanoquinodimethane(1518-16-7)ESR
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| Well-known Reagent Company Product Information | Back Directory | [Acros Organics]
7,7,8,8-Tetracyanoquinodimethane, 98%(1518-16-7) | [Alfa Aesar]
7,7,8,8-Tetracyanoquinodimethane, 98%(1518-16-7) | [Sigma Aldrich]
1518-16-7(sigmaaldrich) | [TCI AMERICA]
7,7,8,8-Tetracyanoquinodimethane,>98.0%(T)(1518-16-7) |
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