Rational Design of a Phosphorus-Centered Disbiradical.
Angew Chem Int Ed Engl
; 63(10): e202318210, 2024 Mar 04.
Article
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| MEDLINE
| ID: mdl-38117661
ABSTRACT
Phosphorus-centered disbiradicals, in which the radical sites exist as individual spin doublets with weak spin-spin interaction have not been known so far. Starting from monoradicals of the type [â
P(µ-NTer)2 P-R], we have now succeeded in linking two such monoradical phosphorus centers by appropriate choice of a linker. To this end, biradical [â
P(µ-NTer)2 Pâ
] (1) was treated with 1,6-dibromohexane, affording the brominated species {Br[P(µ-NTer)]2 }2 C6 H12 (3). Subsequent reduction with KC8 led to the formation of the disbiradical {â
[P(µ-NTer)]2 }2 C6 H12 (4) featuring a large distance between the radical phosphorus sites in the solid state and formally the highest biradical character observed in a P-centered biradical so far, approaching 100 %. EPR spectroscopy revealed a three-line signal in solution with a considerably larger exchange interaction than would be expected from the molecular structure of the single crystal. Quantum chemical calculations revealed a highly dynamic conformational space; thus, the two radical sites can approach each other with a much smaller distance in solution. Further reduction of 4 resulted in the formation of a potassium salt featuring the first structurally characterized P-centered distonic radical anion (5- ). Moreover, 4 could be used in small molecule activation.
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MEDLINE
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En
Revista:
Angew Chem Int Ed Engl
Año:
2024
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Article
País de afiliación:
Alemania