Chemistry of the Phosphorus−Nitrogen Ligands. Multiple Isomeric Transformations of the Diphosphinohydrazine Bearing 8-Quinolyl Substituent: P→C, P→N, and P→P Migrations Caused by Different Factors
作者:Alexander N. Kornev、Natalia V. Belina、Vyacheslav V. Sushev、Julia S. Panova、Olga V. Lukoyanova、Sergey Y. Ketkov、Georgy K. Fukin、Mikhail A. Lopatin、Gleb A. Abakumov
DOI:10.1021/ic101410u
日期:2010.10.18
The reaction of 8-quinolylhydrazine with 2 equiv of Ph2PCl in the presence of Et3N gives 8-[(Ph2P)(2)NNH]-Quin (1) (Quin = quinolyl) in 84% yield. The heating of 1 at 130 degrees C for 1 h in toluene results in migration of the [Ph2PNPPh2] group to a carbon atom of the quinolyl fragment to form an isomer, 7-(Ph2P-N=PPh2)-8-NH2-Quin (2). The same migration is caused by the addition of LiN(SiMe3)(2) to 1. On the contrary, lithiation of 1 with n-BuLi followed by the addition of ZnI2 (1:1) affords the aminoquinolyl-phosphazenide dinuclear complex [ZnI(8-Quin-NPPh2=N-PPh2)(KN)-N-3,N,P](2) (4), which is a result of P -> N migration. Compound 1 itself reacts with ZnI2 in THF to form 4 and protonated molecule 1 center dot HI, which rearranges to the more stable iminobiphosphine salt (Ph2P-PPh2=N-NH-Quin-8) center dot HI. Zinc iodide reacts with 2 equiv of the lithium salt of 1 without rearrangement, to form homoleptic aminoquinolyl zinc complex Zn[(Ph2P)(2)NN-Quin-8}-k(2)N,N](2) (6). Solutions of 4 and 2 in dichloromethane show luminescence at 510 and 460 nm (quantum yields are 45% and 7%, respectively). DFT calculations were provided for possible isomers and their complexes.