在本文中,已经制备了一系列八种基于Ti(IV)哌嗪的配合物,并通过X射线晶体学对其进行了固态表征,并通过NMR光谱对其进行了完全表征。在固态下,根据起始配体的性质,观察到Ti 2(L)(O i Pr)6或Ti 2(L)2(O i Pr)4。对于具有较少空间要求的配体(1 H 2和2 H 2)的配合物,观察到平衡:2 Ti 2(L)(O我PR)6 ⇔的Ti 2(大号)2(O我PR)4 + 2的Ti(O我PR)4。已经通过可变温度NMR光谱研究了热力学性质(ΔG,ΔH和ΔS)。随着越来越多的空间要求的配位体(3- 8 ħ 2)将Ti 2(大号)(O我PR)6固态和溶液中最普遍的形式是形式。这些配合物已经在熔融和溶液条件下进行了生产高丙交酯的测试,并获得了很高的转化率。
Syntheses of Mononuclear and Dinuclear Aluminum Complexes Stabilized by Phenolato Ligands and Their Applications in the Polymerization of ε-Caprolactone: A Comparative Study
作者:Lijuan Chen、Wenyi Li、Dan Yuan、Yong Zhang、Qi Shen、Yingming Yao
DOI:10.1021/acs.inorgchem.5b00022
日期:2015.5.18
5 equiv of AlEt3 led to the isolation of mononuclear monoalkyl complexes AlEt[NO]22 (12) and AlEt[NO]32 (13), respectively. All complexes have been characterized by elemental analysis and NMR spectroscopy, and the solid state structures of 5 complexes have been determined by X-ray diffraction analysis. The activities of both binuclear and mononuclear aluminumcomplexes in initiating the ring-opening
已经通过烷烃消除反应制备了一系列由酚基配体稳定的单核和双核烷基铝配合物。哌嗪桥双(酚)C 4 H 8 N 2 [1,4-(2-OH-3,5-Me 2 -C 6 H 2 CH 2)2 ](H 2 [ONNO] 1)的处理,C 4 H 8 N 2 [1,4-(2-OH-3- t Bu-5-Me-C 6 H 2 CH 2)2 ](H 2 [ONNO] 2)和C 4 H8 N 2 [1,4-(2-OH-3,5- t Bu 2 -C 6 H 2 CH 2)2 ](H 2 [ONNO] 3)和2.5-3当量的AlR 3(R = Me等)得到双核铝络合物(AlMe 2)2 [ONNO] 1(1),(AlMe 2)2 [ONNO] 2(2),(AlMe 2)2 [ONNO] 3(3),(AlEt 2)2 [ONNO]1(4),(AlEt 2)2 [ONNO] 2(5)和(AlEt 2)2 [ONNO] 3
Highly heteroselective ring-opening polymerization of racemic lactide initiated by divalent ytterbium complexes bearing amino bis(phenolate) ligands
作者:Sheng Yang、Zhu Du、Yong Zhang、Qi Shen
DOI:10.1039/c2cc34451c
日期:——
Polymerization of racemic lactideinitiated by divalent ytterbium complexes supported by either dimethylamino-amino bis(phenolate) or methoxy-amino bis(phenolate) ligands proceeds rapidly at room temperature in a living fashion to give heterotactic polylactide with the racemic enchainment of monomer units P(r) ranging from 0.97-0.99.
Crystallographic characterisation of Ti(iv) piperazine complexes and their exploitation for the ring opening polymerisation of rac-lactide
作者:Stuart L. Hancock、Mary F. Mahon、Matthew D. Jones
DOI:10.1039/c0dt01542c
日期:——
In this paper a series of eight Ti(IV) piperazine based complexes have been prepared and fully characterised in the solid-state by X-ray crystallography and in solution viaNMR spectroscopy. In the solid-state either Ti2(L)(OiPr)6 or Ti2(L)2(OiPr)4 were observed depending upon the nature of the starting ligand. For complexes with less sterically demanding ligands (1H2 and 2H2) an equilibrium was observed:
在本文中,已经制备了一系列八种基于Ti(IV)哌嗪的配合物,并通过X射线晶体学对其进行了固态表征,并通过NMR光谱对其进行了完全表征。在固态下,根据起始配体的性质,观察到Ti 2(L)(O i Pr)6或Ti 2(L)2(O i Pr)4。对于具有较少空间要求的配体(1 H 2和2 H 2)的配合物,观察到平衡:2 Ti 2(L)(O我PR)6 ⇔的Ti 2(大号)2(O我PR)4 + 2的Ti(O我PR)4。已经通过可变温度NMR光谱研究了热力学性质(ΔG,ΔH和ΔS)。随着越来越多的空间要求的配位体(3- 8 ħ 2)将Ti 2(大号)(O我PR)6固态和溶液中最普遍的形式是形式。这些配合物已经在熔融和溶液条件下进行了生产高丙交酯的测试,并获得了很高的转化率。
Synthesis and molecular structure of piperazidine-bridged bis(phenolate) samarium(ii) complex and its reactivity to carbodiimides
作者:Zhu Du、Yong Zhang、Yingming Yao、Qi Shen
DOI:10.1039/c1dt10081e
日期:——
of 2 reveals a tetrametallic macrocyclic structure, which represents the first example of a crystal structure of a Sm(II) complex stabilized by heteroatom bridged bis(phenolate) ligands. Reduction of carbodiimides RNCNR (R = iPr and Cy) by [SmL]2(THF) 1, which was formed in situ by the reaction of Sm[N(TMS)2]2(THF)2 with H2L in THF, yielded the Sm(III) complex with an oxalamidinate ligand [LSm(NiPr