Making Ns meet: Triphenylphosphinazine N2(PPh3)2 is a donor–acceptor complex between nitrogen in the highly excited 1Γg state and two anti-periplanar coordinated phosphine ligands (see structure). Although the dissociation into N2+2 PPh3 is calculated to be exergonic by 75 kcal mol−1, the compound is kinetically very stable as a result of the very large Lewis acidity of N2 in the excited 1Γg state.
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