含胺-亞胺異官能雙牙配位基平面四邊形鈀(II)金屬錯合物之合成、幾何異構化及反應活性的研究

王育恒

doi:10.6342/NTU.2009.01258

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含胺-亞胺異官能雙牙配位基平面四邊形鈀(II)金屬錯合物之合成、幾何異構化及反應活性的研究

Study of the Square Planar Methylpalladium (II) Complexes Bearing Unsymmetrical α-Aminoaldimine Bidentate Ligands of Hetero Functionalities: Synthesis, Geometrical Isomerism and Reactivity

王育恒 , Masters　　Advisor：陳竹亭　　

繁體中文 DOI： 10.6342/NTU.2009.01258

不對稱雙牙基；甲基鈀；幾何異構物；結晶學分析；一氧化碳和丁炔二酸二甲酯嵌入反應； unsymmetrical bidentate ligand ； methylpalladium ； geometrical isomer ； crystallographic analysis ； CO, DMAD Insertion

Abstract │ Reference (141) │ Altmetrics

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A series of unsymmetrical bidentate ligands of α-aminoaldimines in the form of R1R2NCMe2CH=NR (R1, R2 = Me, Et, c-C4H8 or R1 = iPr, tBu, R2 = H; R = Me, Et, iPr, tBu) have been synthesized using condensation of 2,2-aminoethylpropanal with such ligands can replace COD in (COD)PdMeCl to give neutral methylchloropalladium complexes contain geometrical isomers with square planar configuration, and cis-trans isomerism was observed in solutions.  However, it is interested that crystallographic analysis gives only single form crystal.  Which geometrical isomers could be available depending on the relative stability in solution.  The equilibrium constant of the isomerization may be fine-tuned in terms of the variation of the ligand substituents.  Kinetic and mechanistic studies for the substitution and isomerization reactions are investigated by varied temperature 1H NMR.  The rate constant of isomerization is 6.97 × 10-5 s-1 at -10℃, 5.29 × 10-4 s-1 at 0℃, and 3.49 × 10-3 s-1 at 10℃, and the activation energy is 120 kJ/mol.  The geometrical isomerization is proposed to proceed via an imine dissociation and re-coordination.  The CO- and CNR- inserted products of [R1R2NCMe2CH=NR]PdMeCl also contain geometrical isomers, and the reactivity is differentiated toward DMAD.  Here we report the variation in insertion rate constant and proposed mechanism between cis and trans form.

Reference ( 141 ) 〈TOP〉

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