Complexation properties of N-thiophosphorylated thiourea 2-PyNHC(S)NHP(S)(OiPr)2 towards NiII
作者:Damir A. Safin、Maria G. Babashkina、Piotr Kubisiak、Mariusz P. Mitoraj、Koen Robeyns、Etienne Goovaerts、Yann Garcia
DOI:10.1039/c3dt32886d
日期:——
Reaction of the deprotonated N-thiophosphorylated thiourea 2-PyNHC(S)NHP(S)(OiPr)2 (HL) with NiCl2 leads to the complex [Ni2-PyNHC(S)NP(S)(OiPr)2}2] ([NiL22]) with unprecedented 1,5,7-N,N′,S-coordination of the ligand. Recrystallization of [NiL2] from a mixture of CH2Cl2–n-hexane or acetone–n-hexane leads to [Ni(L-1,5,7-N,N′,S)2]·CH2Cl2 and [Ni(L-1,5,7-N,N′,S)2], respectively. The latter complex, in turn, shows a temperature-induced polymorphism. [NiL2] in solution shows a paramagnetic distorted octahedral structure where the metal center is coordinated through the nitrogen atoms of the phosphorylamide and pyridyl group functions, and oxygen atoms of the phosphorylamide unit. Furthermore, in the solid state at low temperature, [Ni(L-1,5,7-N,N′,S)2] is shown from high-frequency EPR measurements to possess an S = 1 ground state with large anisotropy.
去质子化的 N-硫代磷酸化硫脲 2-PyNHC(S)NHP(S)(OiPr)2 (HL) 与 NiCl2 反应,生成[Ni2-PyNHC(S)NP(S)(OiPr)2}2]复合物([NiL22]),配体前所未有地具有 1,5,7-N,N′,S-配位。从 CH2Cl2-n- 己烷或丙酮-n-己烷的混合物中重结晶 [NiL2] 后,分别得到 [Ni(L-1,5,7-N,N′,S)2]-CH2Cl2 和 [Ni(L-1,5,7-N,N′,S)2]。后一种复合物则表现出温度诱导的多态性。溶液中的[NiL2]显示出顺磁性的扭曲八面体结构,金属中心通过磷酸酰胺和吡啶基官能团的氮原子以及磷酸酰胺单元的氧原子配位。此外,在低温固态下,高频 EPR 测量显示[Ni(L-1,5,7-N,N′,S)2] 具有 S = 1 基态,并具有较大的各向异性。