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E-waste Monitor – 2017, United Nations University (UNU),
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charge density transferred by the DS donor molecule and
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generally form only 1 : 1 charge-transfer complexes with I2
in nonpolar solvents according to the equilibrium DS + I2 =
DSꢀI2. The formation constant of the 1 : 1 complex is related
to the equilibrium molar concentrations by the equation
Kf = [DSꢀI2]/[DS][I2]. The calculated Kf values spread over a
very wide range of values depending on the nature of the
International Telecommunication Union (ITU) & International
Solid Waste Association (ISWA), Bonn/Geneva/Vienna, https://
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2ꢁ
S–I–I fragment can be considered as a charge-transfer
process. It occurs via the transfer of charge density from a
lone pair of electrons (n) on the donor atom to the empty s*
antibonding orbital of the iodine species. Depending on the
two donor iodides, in this situation the I–I antibonding
orbital (s*) is populated, and the I–I bond is weakened
(n - s* ’ n). The I–I bond length increases from 2.72(1) Å
2ꢁ
in solid I2 to 2.783 Å in the I4 dianion, consequently, the
New J. Chem.
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