Characterization of compounds derived from copper-oxamate and imidazolium by X-ray absorption and vibrational spectroscopies

Nascimento, Gustavo M. do; Pim, Walace D. do; Reis, Daniella O.; Simões, Tatiana R. G.; Pradie, Noriberto A.; Stumpf, Humberto O.

doi:10.1016/j.saa.2015.02.012

Cited by 9 publications

(5 citation statements)

References 39 publications

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“…Sample 2 was prepared by mixing 10 mL of bmimCl (0.61 mmol) solution in dmso and CNTs (1 mg) under similar conditions to sample 1 . A solution of 0.06 mmol of (bmim) 2 [Cu(opba)]·3H 2 O in 20 mL of dmso was added slowly and under constant stirring into the suspension of CNTs, followed by the addition of MnCl 2 ·4H 2 O solution (0.02 mmol in 10 mL of dmso). Then the sample 2 was centrifuged and dried at the same conditions used to sample 1 .…”

Section: Methodsmentioning

confidence: 99%

Selective Wrapping of Few-Walled Carbon Nanotubes by a Serpent-Like Heterobimetallic Coordination Polymer

et al. 2016

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In this work, selective interactions between the constituents of the composite CNT@MnCu (2) prepared using carbon nonotubes (CNTs) (1) and the heterobimetallic chain [MnCu(opba)] n (MnCu), opba = o-phenylenebis(oxamate), were studied mainly by resonance Raman spectroscopy and high-resolution transmission electron microscopy (HRTEM). An apparent interaction between CNTs and MnCu complex with the wrapping of the former by the heterobimetallic complex was observed in the microscopy images. The resonance Raman data suggest that the interations between MnCu complex and the CNTs are selective, occurring mainly with metallic CNTs independently of the diameter and excitation energy. However, for semiconducting CNTs, these interactions solely occur with tubes having diameters higher than ca. 1.47 nm.

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Section: Methodsmentioning

confidence: 99%

Selective Wrapping of Few-Walled Carbon Nanotubes by a Serpent-Like Heterobimetallic Coordination Polymer

et al. 2016

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“…Through the years, the infrared and Raman spectroscopies have been the techniques par excellence for the investigation of the vibrational structure of conjugated materials, such as dyes [25], metallic complexes [26][27][28], conducting polymers [29,30], nanocomposites [31][32][33], and carbon allotropes [34][35][36][37][38][39]. The laser is the common source in Raman spectroscopy, the radiation interacts with the sample through the scattering process.…”

Section: Raman Spectroscopy and Imagingmentioning

confidence: 99%

“…The resonance Raman spectroscopy technique is sensitive to the electronic, structural, and vibrational properties of CNTs. Our group is using resonance Raman spectroscopy to characterize the interactions between nanotubes and different kinds of molecules [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39], such as the conducting polyaniline (PANI), molecular magnets such as (NBu 4 ) 2 [Cu(opba)], [MnCu(opba)] n chains, where opba = ortho-phenylenebis(oxamate), dyes such as phenosafranine (PS) and Nile Blue (NB), and CNTs doped with bromine or iodine.…”

Section: Resonance Raman Of Modified Single-and Double-walled Carbon mentioning

confidence: 99%

Raman Spectroscopy and Imaging of Carbon Allotropes

Nascimento¹

2020

Modern Spectroscopic Techniques and Applications

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Raman spectroscopy is employed to study a myriad of complex materials due to the coupling of different resonances process and microscopic resources. For instance, vibrational and electronic aspects of carbon allotropes can be deeply investigated by resonance Raman spectroscopy. By selecting the appropriate laser line, it is possible to monitor different aspects of the samples, such as the behavior of metallic or semiconducting tubes and the graphene with different layers or chemical modifications. In this chapter, the potentialities of Raman technique will be exemplified in some examples obtained in our group about the characterization of carbon nanotubes and graphene. For instance, the doping process of nanotubes, carbon tube interactions with molecular magnets, and inhomogeneity of graphene samples will be discussed.

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“…This unusual coordination mode for meta-substituted bis-oxamate ligand in 1 is reported here for the first time, despite it has been already described for ortho [26,38,39] and para [40] derivatives. It is important to point out that several counterions were used to obtain [Cu 2 (µ-mpba) 2 ] 4− complexes in the literature such as Na + [12], Li + [41,42], methylviologen (MV 2+ ) [43] 1-alkyl-3-methylimidazolium [C 4 MIm] + [44] and (S)-1-phenylethyl-trimethylammonium [(S)-(1-PhEt)Me 3 N] + [45] for instance, as described in the literature. In these cases, the resulting structures were composed by the [3,3] metallacyclophane-type motif of dicopper(II) ions in a dinuclear entity containing mpba as ligand.…”

Section: Description Of the Crystal Structures Of 1 Andmentioning

confidence: 99%

“…Anal. Calcd for C44 H 56 ClCu 2 KN 12 O 20 (2): C, 41.46; H, 4.43; N, 13.19; Cu, 9.97. Found: C, 42.31; H, 4.36; N, 13.34, Cu, 9.99%.…”

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confidence: 99%

Heterobimetallic One-Dimensional Coordination Polymers MICuII (M = Li and K) Based on Ferromagnetically Coupled Di- and Tetracopper(II) Metallacyclophanes

Cunha¹,

Oliveira²,

Pedroso³

et al. 2018

Magnetochemistry

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The synthesis, crystal structure and magnetic properties of the coordination polymers of formula [EDAP{Li6(H2O)8[(Cu2(μ-mpba)2)2(H2O)2]}]n (1) and [(EDAP)2{K(H2O)4[Cu2(μ-mpba)2(H2O)2]}Cl·2H2O]n (2), in which mpba = N,N′-1,3-phenylenebis(oxamate) and EDAP2+ = 1,1′-ethylenebis(4-aminopyridinium) are described. Both compounds have in common the presence of the [Cu2(mpba)2]4− tetraanionic unit which is a [3,3] metallacyclophane motif in which the copper(II) ions are five-coordinate in a distorted square pyramidal surrounding. The complex anion in 1 is dimerized through double out-of-plane copper to outer carboxylate-oxygen atoms resulting in the centrosymmetric tetracopper(II) fragment [Cu4(μ-mpba)4(H2O)2]8− which act as a ligand toward six hydrated lithium(I) cations leading to anionic ladder-like double chains whose charge is neutralized by the EDAP2+ cations. In the case of 2, each dicopper(II) entity acts as a ligand towards tetraquapotassium(I) units to afford anionic zig zag single chains of formula {K(H2O)4[Cu2(μ-mpba)2(H2O)2]}n3n− plus EDAP2+ cations and non-coordinate chloride anions. Cryomagnetic measurements on polycrystalline samples 1 and 2 show the occurrence of ferromagnetic interactions between the copper(II) ions across the –Namidate–(C–C–C)phenyl–Namidate– exchange pathway [J = +10.6 (1) and +8.22 cm−1 (2)] and antiferromagnetic ones through the double out-of-plane carboxylate-oxygen atoms [j = −0.68 cm−1 (1), the spin Hamiltonian being defined as H = − J ( S C u 1 · S C u 2 + S C u 2 i · S C u 1 i ) − j ( S C u 2 · S C u 2 i ) ].

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Characterization of compounds derived from copper-oxamate and imidazolium by X-ray absorption and vibrational spectroscopies

Cited by 9 publications

References 39 publications

Selective Wrapping of Few-Walled Carbon Nanotubes by a Serpent-Like Heterobimetallic Coordination Polymer

Selective Wrapping of Few-Walled Carbon Nanotubes by a Serpent-Like Heterobimetallic Coordination Polymer

Raman Spectroscopy and Imaging of Carbon Allotropes

Heterobimetallic One-Dimensional Coordination Polymers MICuII (M = Li and K) Based on Ferromagnetically Coupled Di- and Tetracopper(II) Metallacyclophanes

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