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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
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IR Absorption Frequency: Hybridization01:21

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Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
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Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism01:18

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Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
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Thermal Electrocyclic Reactions: Stereochemistry01:17

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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Stereoisomerism02:52

Stereoisomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Carborane tuning on iridium complexes: redox-switchable second-order NLO responses.

Jiao Wang1, Wen-Yong Wang, Xin-Yan Fang

  • 1Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin, 130024, People's Republic of China.

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Oxidation significantly enhances nonlinear optical (NLO) properties in iridium (Ir) complexes with carborane groups. DFT calculations show oxidized species exhibit greatly improved NLO responses due to altered charge transfer patterns.

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Area of Science:

  • Inorganic Chemistry
  • Computational Chemistry
  • Materials Science

Background:

  • Iridium complexes with carborane groups are investigated for their electronic and optical properties.
  • Nonlinear optical (NLO) properties are crucial for advanced optical materials.
  • Understanding structure-property relationships is key for designing functional materials.

Purpose of the Study:

  • To investigate the impact of redox processes on the NLO properties of Ir-carborane complexes.
  • To explore how oxidation affects molecular geometry and electronic structure.
  • To determine methods for enhancing second-order NLO responses.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed.
  • Molecular geometries, electronic structures, and redox properties were analyzed.
  • Nonlinear optical (NLO) properties, specifically second-order responses (β tot), were computed.

Main Results:

  • Oxidation reactions significantly influence the second-order NLO response by altering charge transfer patterns.
  • Oxidized Ir-carborane complexes showed substantially larger β tot values (up to ~9 times).
  • Incorporating carborane groups into phenylpyridine (ppy) ligands enhanced NLO response via metal-to-ligand charge transfer (MLCT).

Conclusions:

  • Second-order NLO response in Ir complexes can be effectively enhanced through oxidation.
  • Redox-switchable NLO properties were observed, driven by changes in coordination bonds and charge transfer.
  • The findings provide insights into designing Ir complexes with tunable NLO characteristics.