The new phosphorus-containing heterotridentate ligands 2-(2-Ph2P)C6H4CHNCH(Me)CH(OH)Ph-1S,2R (HL1) and 2-(2-Ph2P)C6H4NCHC6H4OH (HL2) were prepared by the condensation of 2-(diphenylphosphino)benzaldehyde with 1S,2R-norephedrine (HL1) and 2-(diphenylphosphino)aniline with salicylaldehyde (HL2). The co-ordination chemistry of HL1 and HL2 with Group 10 metals was explored, together with that of the previously reported ligand 2-(2-Ph2P)C6H4CHNC6H4OH (HL3) which is isomeric with (HL2). Compound HL1 affords cationic complexes of general formula [M(HL1)Cl]Cl, where MÂ =Â Ni (1), Pd (2) or Pt (3). Spectroscopic, microanalytical and crystallographic data for 1â3 confirm that deprotonation of the hydroxyl group does not occur on complexation. In contrast, both HL2 and HL3 deprotonate on complexation to form neutral species of general formula [MLCl] where LÂ =Â L2, MÂ =Â Ni (4), Pd (5) or Pt (6); LÂ =Â L3, MÂ =Â Ni (7), Pd (8) or Pt (9). The crystal structures of 4, 5, 7 and 9 confirm tridentate PNO co-ordination of the deprotonated ligands to the metal centres, forming 5- and 6-membered rings.
通过缩合 2-(2-Ph2P)C6H4CHNCH(Me)CH(OH)Ph-1S、2R(HL1)和 2-(2-Ph2P)C6H4NCHC6H4OH(H
L2)是由 2-(
二苯基膦)
苯甲醛与 1S,2R-
去甲麻黄碱(HL1)和
2-(二苯基膦)苯胺与
水杨醛(H
L2)缩合制备的。研究人员探讨了 HL1 和 H
L2 与第 10 族
金属的配位
化学,以及以前报道过的
配体 2-(2-Ph2P)C6H4CHNC6H4OH (HL3) 与 (H
L2) 的同分异构体的配位
化学。化合物 HL1 生成通式为 [M(HL1)Cl]Cl 的阳离子配合物,其中 MÂ =Â Ni (1)、Pd (2) 或 Pt (3)。1â3 的光谱、微分析和晶体学数据证实,羟基在络合时不会发生去质子化反应。相反,H
L2 和 HL3 在络合时都会发生去质子化反应,形成通式 [MLCl] 的中性物质,其中 LÂ =Â
L2,MÂ =Â Ni (4)、Pd (5) 或 Pt (6);LÂ =Â L3,MÂ =Â Ni (7)、Pd (8) 或 Pt (9)。4、5、7 和 9 的晶体结构证实了去质子化
配体与
金属中心的三方
PNO 配位,形成 5 元环和 6 元环。