Chalcogen-grafted carbon materials and processes for their preparation
AssigneeValorisation-Recherche, Limited Partnership
InventorsRichard Martel, Rafaella Oliveira Do Nascimento, Pierre Lévesque
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Abstract
Chalcogen-grafted carbon material as well as their functionalized forms are described along with processes for their preparation. More specifically, the chalcogen is covalently linked to the carbon scaffold of a polyaromatic carbon via C═X and/or C—X—C bonds. Processes for their preparation include a single thermal treatment without the use of strong acids or anhydrous solvents.
Claims30
A chalcogen-grafted carbon material, wherein the chalcogen-grafted carbon material is a polyaromatic carbon material comprising a polyaromatic fused ring system, and the chalcogen X is covalently linked to the polyaromatic carbon material via C═X bonds on outside rings of said polyaromatic fused ring system and/or C—X—C bonds in the form of 3-membered rings on a surface of said polyaromatic fused ring system, wherein:
- the chalcogen is a chalcogen other than oxygen,
- C is a carbon atom from the polyaromatic fused ring system, and
- wherein the molar ratio of carbon:chalcogen in the chalcogen-grafted carbon material is within the range of from 2:1 to 1000:1.
A functionalized chalcogen-grafted carbon material, wherein the chalcogen-grafted carbon material is a polyaromatic carbon material comprising a polyaromatic fused ring system comprising C—X—C in the form of 3-membered rings on a surface of said polyaromatic fused ring system and C═X bonds on outside rings of said polyaromatic fused ring system, and is functionalized with —XH, —XR, or a combination thereof, or a complex or salt thereof, wherein X is a chalcogen covalently linked to the polyaromatic carbon material, and R is a functional group, or R is another X from the functionalized chalcogen-grafted carbon material thereby forming a C—X—X—C dichalcogenide bond, wherein the chalcogen is a chalcogen other than oxygen, and wherein C is a carbon atom from the polyaromatic carbon material.
A process for the preparation of a chalcogen-grafted carbon material, comprising the steps of:
- (a) disposing a polyaromatic carbon material in a first compartment and a chalcogen in a second compartment, where the first and second compartments are connected to allow gaseous exchange without direct physical contact between the polyaromatic carbon and chalcogen;
- and
- (b) simultaneously heating the first compartment at a first temperature and the second compartment at a second temperature;
- wherein the first temperature is higher than the second temperature and wherein the second temperature allows the sublimation of the chalcogen;
- wherein said chalcogen is a chalcogen other than oxygen.
Dependencies are inferred from the claim text.