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Nitric Oxide Insertion into a Metalloporphyrin-Carbon Bond
Jennifer Londoño-Salazar1, Guan Ye1, Chance W Lander1
1Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States.
This study demonstrates the first nitric oxide (NO) insertion into a metalloporphyrin metal-carbon bond. Researchers observed selective NO insertion into the ortho-chlorophenyl isomer of a rhodium complex.
Area of Science:
- Organometallic Chemistry
- Materials Science
- Chemical Crystallography
Background:
- Nitric oxide (NO) insertion reactions are common in coordination-organometallic chemistry.
- Metalloporphyrins are crucial in various biological and catalytic processes.
- Understanding metal-carbon bond reactivity is key to designing new catalysts.
Purpose of the Study:
- To investigate the insertion of nitric oxide (NO) into a metalloporphyrin metal-carbon bond.
- To determine the selectivity of NO insertion into different isomers of a rhodium-aryl complex.
- To elucidate the mechanism and driving forces behind NO insertion into metalloporphyrins.
Main Methods:
- Crystallization of a rhodium-aryl complex, (TPP)-Rh-(C6H4Cl)-(CH2Cl2)x.
- Exposure of the crystals to nitric oxide (NO) gas over two weeks.
- Structural characterization of the NO-inserted product using X-ray crystallography.
- Computational analysis using Density Functional Theory (DFT) to predict reactivity.
Main Results:
- Successful insertion of NO into the rhodium-carbon bond of the metalloporphyrin complex.
- Selective insertion of NO into the ortho-chlorophenyl isomer, yielding (TPP)-Rh-(ONC6H4Cl-o)-(CH2Cl2)0.5·(TPP)-Rh-(C6H4Cl-p/m)-(CH2Cl2)0.5.
- Para- and meta-chlorophenyl isomers showed no NO insertion.
- DFT calculations supported the higher reactivity of the ortho-Cl isomer.
Conclusions:
- This work reports the first instance of nitric oxide insertion into a metalloporphyrin metal-carbon bond.
- The observed regioselectivity is attributed to the inherent reactivity differences between the ortho- and para-/meta-chlorophenyl isomers.
- This finding opens new avenues for functionalizing metalloporphyrins and designing novel organometallic compounds.
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