Abstract: The preparation, structural characterization, luminescence, and catalytic activity of three palladium(II) complexes bearing imino phenoxide ligands are reported. The X-ray studies revealed that the complexes are mononuclear with palladium centres coordinated in a square-planar coordination environment. Two of the complexes are emissive in solution at room temperature. The catalytic activities towards the ring-opening polymerization of -lactide (-LA) were tested. Polymers with moderate molecular weights and relatively broad dispersity () were obtained. Kinetic studies revealed that the polymerization followed first-order kinetics.
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http://dx.doi.org/10.1007/s00706-017-2119-1 | DOI Listing |
Inorg Chem
February 2024
Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan.
The coupled NO-vibrational peaks [IR ν 1775 s, 1716 vs, 1668 vs cm (THF)] between two adjacent [Fe(NO)] groups implicate the electron delocalization nature of the singly -phenoxide-bridged dinuclear dinitrosyliron complex (DNIC) [Fe(NO)(μ-ON)Fe(NO)] (). Electronic interplay between [Fe(NO)] units and [ON] ligand in DNIC rationalizes that "hard" -phenoxide moiety polarizes iron center(s) of [Fe(NO)] unit(s) to enforce a "constrained" π-conjugation system acting as an electron reservoir to bestow the spin-frustrated {Fe(NO)}-{Fe(NO)}-[ON] electron configuration ( = 1/2). This system plays a crucial role in facilitating the ligand-based redox interconversion, working in harmony to control the storage and redox-triggered transport of the [Fe(NO)] unit, while preserving the {Fe(NO)} core in DNICs {Fe(NO)}-[ON] [K-18-crown-6-ether)][(ON)Fe(NO)] () and {Fe(NO)}-[ON] [(ON)Fe(NO)][PF] ().
View Article and Find Full Text PDFPhys Chem Chem Phys
June 2023
Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK.
The synthesis and characterisation of a bis(iminium)phenoxide diacid cation [4-Bu-CH-2,6-(HCN(H)Dipp)-1-O] ([HL]), is discussed. [HL][BF] (1) and [HL][HN{B(CF)}] (2) were synthesised in high yields protonation of the bis(imino)phenol conjugate base with ethereal HBF or Bochmann's acid ([H(OEt)][HN{B(CF)}]). Both species were fully characterised using NMR and IR spectroscopy as well as X-ray crystallography.
View Article and Find Full Text PDFRSC Adv
March 2023
Department of Chemistry, College of Sciences, King Saud University Riyadh 11451 Saudi Arabia.
Two Schiff base complexes of copper(ii) and cobalt(iii) having the formulae [CuL] (Cu-Sal) and [CoL] (Co-Sal) (HL = 2-(((2-hydroxyethyl)imino)methyl)phenol) have been synthesized and characterized microanalytically, spectroscopically and in the case of Cu-Sal using single crystal X-ray diffraction technique. The single crystal X-ray analysis reveals a square planar geometry around Cu(ii) satisfied by phenoxide oxygen and imine nitrogen of the L ligand to generate a six membered chelate ring. The solid state structure of Cu-Sal is satisfied by varied intermolecular non-covalent interactions.
View Article and Find Full Text PDFInorganica Chim Acta
September 2018
Department of Chemistry, Stanford University, Stanford, CA 94305, USA.
The tetradentate mixed imino/amino phenoxide ligand (N-(3,5-di-tert-butylsalicylidene)-N'-(2-hydroxyl-3,5-di-tert-butylbenzyl))-trans-1,2-cyclohexanediamine (salalen) was complexed with Cu, and the resulting Cu complex () was characterized by a number of experimental techniques and theoretical calculations. Two quasi-reversible redox processes for , as observed by cyclic voltammetry, demonstrated the potential stability of oxidized forms, and also the increased electron-donating ability of the salalen ligand in comparison to the salen analogue. The electronic structure of the one-electron oxidized [] was then studied in detail, and Cu K-edge X-ray Absorption Spectroscopy (XAS) measurements confirmed a Cu-phenoxyl radical complex in solution.
View Article and Find Full Text PDFActa Crystallogr C Struct Chem
October 2018
A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninsky prospect, Moscow 119991, Russian Federation.
A simple and effective synthetic route to homo- and heteroleptic rare-earth (Ln = Y, La and Nd) complexes with a tridentate Schiff base anion has been demonstrated using exchange reactions of rare-earth chlorides with in-situ-generated sodium (E)-2-{[(2-methoxyphenyl)imino]methyl}phenoxide in different molar ratios in absolute methanol. Five crystal structures have been determined and studied, namely tris(2-{[(2-methoxyphenyl)imino]methyl}phenolato-κO,N,O)lanthanum, [La(CHNO)], (1), tris(2-{[(2-methoxyphenyl)imino]methyl}phenolato-κO,N,O)neodymium tetrahydrofuran disolvate, [La(CHNO)]·2CHO, (2)·2THF, tris(2-{[(2-methoxyphenyl)imino]methyl}phenolato)-κO,N,O;κO,N,O;κN,O-yttrium, [Y(CHNO)], (3), dichlorido-1κCl,2κCl-μ-methanolato-1:2κO:O-methanol-2κO-(μ-2-{[(2-methoxyphenyl)imino]methyl}phenolato-1κO,N,O:2κO)bis(2-{[(2-methoxyphenyl)imino]methyl}phenolato)-1κO,N,O;2κO,N,O-diyttrium-tetrahydrofuran-methanol (1/1/1), [Y(CHNO)(CHO)Cl(CHO)]·CHO·CHO, (4)·MeOH·THF, and bis(μ-2-{[(2-methoxyphenyl)imino]methyl}phenolato-1κO,N,O:2κO)bis(2-{[(2-methoxyphenyl)imino]methyl}phenolato-2κO,N,O)sodiumyttrium chloroform disolvate, [NaY(CHNO)]·2CHCl, (5)·2CHCl. Structural peculiarities of homoleptic tris(iminophenoxide)s (1)-(3), binuclear tris(iminophenoxide) (4) and homoleptic ate tetrakis(iminophenoxide) (5) are discussed.
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