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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >p-Tolylimido rhenium(V) complexes - synthesis, X-ray studies, spectroscopic characterization, DFT calculations and catalytic activity
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p-Tolylimido rhenium(V) complexes - synthesis, X-ray studies, spectroscopic characterization, DFT calculations and catalytic activity

机译:对甲苯基ido(V)络合物-合成,X射线研究,光谱表征,DFT计算和催化活性

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摘要

Novel p-tolylimido rhenium(V) complexes trans-(Cl,Cl)-[Re(p-NC_6H_4CH_3)Cl_2(py-2-COO)(PPh_3)]?MeCN (1a), trans-(Cl,Cl)-[Re(p-NC_6H_4CH_3)Cl_2(py-2-COO)(PPh_3)] (1b), trans-(Br,Br)-[Re(p-NC_6H_4CH_3)Br_2(py-2- COO)(PPh_3)] (2), cis-(Cl,Cl)-[Re(p-NC_6H_4CH_3)Cl_2(py-2-COO)(PPh_3)] (3), cis-(Br,Br)-[Re(p-NC_6H_4CH_3)- Br_2(py-2-COO)(PPh_3)]?H_2O (4), trans-(Cl,Cl)-[Re(p-NC_6H_4CH_3)Cl_2(OMe)] (5) and trans-(Br,Br)-[Re- (p-NC_6H_4CH_3)Br_2(OMe)(PPh_3)2]?1/2H_2O (6) were synthesized. The compounds were identified by elemental analysis, IR, NMR (~1H, ~(13)C and ~(31)P), UV-Vis spectroscopy and X-ray crystallography. Calculations at the DFT level were undertaken in order to elucidate the structural, spectroscopic and bonding properties of the trans-(Cl,Cl) and cis-(Cl,Cl) isomers of [Re(p-NC_6H_4CH_3)Cl_2(py-2-COO)(PPh_3)]. In the first step, extended tests of the ability of different DFT methods (B_3LYP, BP86, and PBE1PBE) were performed to find the best overall performer in describing the geometry of the imido Re(V) complexes; then, the electronic spectra of the trans and cis isomers of [Re(p-NC_6H_4CH_3)Cl_2(py-2-COO)(PPh_3)] were investigated at the TDDFT level employing the PBE1PBE functional. Additional information about bonding in the compounds [Re- (p-NC_6H_4CH_3)Cl_2(py-2-COO)(PPh_3)] was obtained by NBO analysis. The catalytic activity of the complexes incorporating the picolinate ligand was studied and compared in the synthesis of N-substituted ethyl glycine esters from ethyl diazoacetate and amines.
机译:新型对甲苯基ido(V)配合物反式(Cl,Cl)-[Re(p-NC_6H_4CH_3)Cl_2(py-2-COO)(PPh_3)]?MeCN(1a),反式(Cl,Cl)- [Re(p-NC_6H_4CH_3)Cl_2(py-2-COO)(PPh_3)](1b),反式-(Br,Br)-[Re(p-NC_6H_4CH_3)Br_2(py-2-COO)(PPh_3)] (2),顺式-(Cl,Cl)-[Re(p-NC_6H_4CH_3)Cl_2(py-2-COO)(PPh_3)](3),顺式-(Br,Br)-[Re(p-NC_6H_4CH_3) -Br_2(py-2-COO)(PPh_3)] H_2O(4),反式-(Cl,Cl)-[Re(p-NC_6H_4CH_3)Cl_2(OMe)](5)和反式-(Br,Br)合成了[[Re-(p-NC_6H_4CH_3)Br_2(OMe)(PPh_3)2]→1 / 2H_2O(6)。通过元素分析,IR,NMR(〜1H,〜(13)C和〜(31)P),​​UV-Vis光谱学和X射线晶体学鉴定化合物。为了阐明[Re(p-NC_6H_4CH_3)Cl_2(py-2-)的反式(Cl,Cl)和顺式(Cl,Cl)异构体的结构,光谱和键合性质,进行了DFT级的计算。 COO)(PPh_3)]。第一步,对不同DFT方法(B_3LYP,BP86和PBE1PBE)的能力进行了扩展测试,以发现在描述亚胺基Re(V)配合物的几何形状方面最佳的整体性能;然后,使用PBE1PBE官能团在TDDFT级别研究了[Re(p-NC_6H_4CH_3)Cl_2(py-2-COO)(PPh_3)]的反式和顺式异构体的电子光谱。通过NBO分析获得有关化合物[Re-(p-NC_6H_4CH_3)Cl_2(py-2-COO)(PPh_3)]中键合的其他信息。在由重氮乙酸乙酯和胺合成N-取代的乙基甘氨酸酯的过程中,研究了并结合了吡啶甲酸配体的配合物的催化活性。

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