Английская Википедия:Carbon dichalcogenide

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Carbon dichalcogenides are chemical compounds of carbon and chalcogen elements. They have the general chemical formula CZ2, where Z = O, S, Se, Te.[1][2]

This includes:

Stability

Double bonds between carbon and chalcogen elements, C=Z, become weaker the heavier the chalcogen, Z. This trend means carbon dichalcogenide monomers are less stable and more susceptible to polymerisation as Z changes from O to Te. For example, Шаблон:Chem2 is stable, Шаблон:Chem2 polymerises under extreme conditions, Шаблон:Chem2 tends to polymerise, CSeTe is unstable and Шаблон:Chem2 does not exist.[1] This trend is an example of the double bond rule.

Bonding

In carbon dichalcogenides, C=O bond lengths are around 1.16 Å, C=S around 1.56 Å, C=Se around 1.70 Å and C=Te around 1.90 Å.[3]

Carbon–chalcogen double bond lengths in carbon dichalcogenides, Z=C=Z′
Species Formula Z Z′ Bond Bond in molecule Bond length / Å Method of determination Reference
Carbon dioxide CO2 O O C=O O=C=O 1.163 infrared spectroscopy [1][3][4]
Carbonyl sulfide OCS O S C=O S=C=O 1.158 microwave spectroscopy [5]
Carbonyl selenide OCSe O Se C=O Se=C=O 1.159 microwave spectroscopy [3]
Carbonyl sulfide OCS O S C=S O=C=S 1.560 microwave spectroscopy [5]
Carbon disulfide Шаблон:Chem2 S S C=S S=C=S 1.553 infrared spectroscopy [5]
Thiocarbonyl selenide SCSe S Se C=S Se=C=S 1.553 microwave spectroscopy [5]
Thiocarbonyl telluride SCTe S Te C=S Te=C=S 1.557 microwave spectroscopy [3][5][6]
Carbonyl selenide OCSe O Se C=Se O=C=Se 1.709 microwave spectroscopy [5]
Thiocarbonyl selenide SCSe S Se C=Se S=C=Se 1.693 microwave spectroscopy [5]
Carbon diselenide Шаблон:Chem2 Se Se C=Se Se=C=Se 1.689 neutron diffraction [7]
Thiocarbonyl telluride SCTe S Te C=Te S=C=Te 1.904 microwave spectroscopy [3][5][6]

References

Шаблон:Reflist

Шаблон:Chemistry index