Copper(I) complexes with Schiff base and 1,2-bis(diphenylphosphino)ethane as ligands: Synthesis, structure and catalytic properties for the amination of aryl halide

Chavan, S.S.; Sawant, S.K.; Sawant, V.A.; Lahiri, Goutam Kumar

doi:10.1016/j.ica.2010.06.023

Cited by 16 publications

(1 citation statement)

References 26 publications

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“…Transition metal complexes containing ancillary ligands, pyridyl-imines and N-substituted 2-iminoalkylpyridines have been applied for synthetic, spectroscopic and kinetic studies, [1][2][3][4][5][6][7][8][9][10] photoluminescence and photochemistry, 11 as catalysts for organic transformation, [12][13][14][15][16][17][18] electrochemistry, [19][20][21] bioinorganic chemistry, 22,23 supramolecular chemistry, 24,25 molecular magnetism [26][27][28][29] and olefin polymerisation. [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] In contrast, poly(methylmethacrylate) (PMMA) is a universal polymer with optical applications.…”

Section: Introductionmentioning

confidence: 99%

Cd(II) and Zn(II) Complexes Containing N,N'-Bidentate N-(Pyridin-2-ylmethylene)cyclopentanamine: Synthesis, Characterisation and Methyl Methacrylate Polymerisation

Song¹,

Kim²,

Lee³

et al. 2014

Bulletin of the Korean Chemical Society

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The reaction between [CdBr 2 ·4H 2 O] and anhydrous [ZnCl 2 ] with N,N'-bidentate N-(pyridin-2-ylmethylene)-cyclopentanamine (impy) in ethanol yields dimeric [(impy)Cd(µ-Br)Br] 2 and monomeric [(impy)ZnCl 2 ] complexes, respectively. The X-ray crystal structure of Cd(II) and Zn(II) complexes revealed that the cadmium atom in [(impy)Cd(µ-Br)Br] 2 and zinc in [(impy)ZnCl 2 ] formed a distorted trigonal-bipyramidal and tetrahedral geometry, respectively. Both complexes showed moderate catalytic activity for the polymerisation of methyl methacrylate (MMA) in the presence of modified methylaluminoxane (MMAO), with polymethylmethacrylate (PMMA) syndiotacticity of about 0.70.

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Section: Introductionmentioning

confidence: 99%

Cd(II) and Zn(II) Complexes Containing N,N'-Bidentate N-(Pyridin-2-ylmethylene)cyclopentanamine: Synthesis, Characterisation and Methyl Methacrylate Polymerisation

Song¹,

Kim²,

Lee³

et al. 2014

Bulletin of the Korean Chemical Society

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Coordination Polymer Flexibility Leads to Polymorphism and Enables a Crystalline Solid–Vapour Reaction: A Multi‐technique Mechanistic Study

Vitórica-Yrezábal

Libri

Loader

et al. 2015

Chemistry A European J

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Despite an absence of conventional porosity, the 1D coordination polymer [Ag4(O2C(CF2)2CF3)4(TMP)3] (1; TMP=tetramethylpyrazine) can absorb small alcohols from the vapour phase, which insert into Ag–O bonds to yield coordination polymers [Ag4(O2C(CF2)2CF3)4(TMP)3(ROH)2] (1-ROH; R=Me, Et, iPr). The reactions are reversible single-crystal-to-single-crystal transformations. Vapour-solid equilibria have been examined by gas-phase IR spectroscopy (K=5.68(9)×10−5 (MeOH), 9.5(3)×10−6 (EtOH), 6.14(5)×10−5 (iPrOH) at 295 K, 1 bar). Thermal analyses (TGA, DSC) have enabled quantitative comparison of two-step reactions 1-ROH→1→2, in which 2 is the 2D coordination polymer [Ag4(O2C(CF2)2CF3)4(TMP)2] formed by loss of TMP ligands exclusively from singly-bridging sites. Four polymorphic forms of 1 (1-ALT, 1-AHT, 1-BLT and 1-BHT; HT=high temperature, LT=low temperature) have been identified crystallographically. In situ powder X-ray diffraction (PXRD) studies of the 1-ROH→1→2 transformations indicate the role of the HT polymorphs in these reactions. The structural relationship between polymorphs, involving changes in conformation of perfluoroalkyl chains and a change in orientation of entire polymers (A versus B forms), suggests a mechanism for the observed reactions and a pathway for guest transport within the fluorous layers. Consistent with this pathway, optical microscopy and AFM studies on single crystals of 1-MeOH/1-AHT show that cracks parallel to the layers of interdigitated perfluoroalkyl chains develop during the MeOH release/uptake process.

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Complexes of Copper(I) Thiocyanate with Monodentate Phosphine and Pyridine Ligands and the P(,N)‐Donor Diphenyl(2‐pyridyl)phosphine

et al. 2014

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Copper(I) thiocyanate derivatives were prepared by the reaction of CuNCS with pyridine (py) and tertiary monophosphine ligands [PR3 in general; in detail: PPh3, triphenylphosphine, P(4‐FPh)3, tris(4‐fluorophenyl)phosphine)], as well as the potentially bidentate ligand diphenyl(2‐pyridyl)phosphine (PPh2py). Mechanochemical methods were used in some cases to investigate stoichieometries that were not easily accessible by conventional solution syntheses. Three forms of the resulting adducts of CuNCS/PR3/py‐base (1:3–n:n) stoichiometry―all containing four‐coordinate copper(I) atoms and monodentate N‐thiocyanate groups―were confirmed crystallographically. Mononuclear arrays are defined for [(PPh2py)3–n(py)nCuNCS], n = 0, 1, 2, the monodentate thiocyanate being N‐coordinated in all; two polymorphs are observed for the n = 2 complex, both crystallizing in monoclinic P21 (Z = 2) cells with similar cell dimensions, but with aromatic components eclipsed about the Cu–P bond in the PPh3 complex, and staggered in the PPh2py complex. Bridging thiocyanate groups are found in the 1:1:1 CuNCS/PPh2py/2‐methylpyridine (mpy) and P(4‐FPh)3/mpy complexes, wherein centrosymmetric dimers with eight‐membered central rings are obtained: [(R3P)(mpy)Cu(NCS)2Cu(PR3)(mpy)], as is also the case in the parent 1:2 CuNCS/PPh2py adduct [(pyPh2P)2Cu(NCS)2Cu(PPh2py)2]. For the 1:1:1 CuNCS/P(4‐FPh)3/py and PPh3/Brmpy (Brmpy = 3‐bromo‐4‐methylpyridine) adducts, and, likely, CuNCS/PPh2py/py (1:1:1), single‐stranded polymers of the form [···Cu(NCS)(PR3)(py‐base)(Cu)···](∞|∞) with linearly bridging NCS ligands were obtained. Some derivatives, representative of all forms, display medium to strong green to blue luminescence when excited with radiation at 365 nm. The 31P CPMAS NMR spectroscopic data clearly differentiate the inequivalent phosphorus positions within each system, showing a wide range of 1J(31P,63/65Cu) values ranging from 965 Hz for [Cu(NCS)(PPh2py)3] to 1540 Hz for dimeric [(4‐FPh)3P(mpy)Cu(NCS)2Cu(P(4‐FPh)3)(mpy)], reflecting the large variations in the Cu–P bond length.

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Copper(I) complexes with Schiff base and 1,2-bis(diphenylphosphino)ethane as ligands: Synthesis, structure and catalytic properties for the amination of aryl halide

Cited by 16 publications

References 26 publications

Cd(II) and Zn(II) Complexes Containing N,N'-Bidentate N-(Pyridin-2-ylmethylene)cyclopentanamine: Synthesis, Characterisation and Methyl Methacrylate Polymerisation

Cd(II) and Zn(II) Complexes Containing N,N'-Bidentate N-(Pyridin-2-ylmethylene)cyclopentanamine: Synthesis, Characterisation and Methyl Methacrylate Polymerisation

Coordination Polymer Flexibility Leads to Polymorphism and Enables a Crystalline Solid–Vapour Reaction: A Multi‐technique Mechanistic Study

Complexes of Copper(I) Thiocyanate with Monodentate Phosphine and Pyridine Ligands and the P(,N)‐Donor Diphenyl(2‐pyridyl)phosphine

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