Flexibility of soft supramolecular materials: polymorphous transition in the [Cu(pyridine)4(NO3)2]*2(pyridine) inclusion compound

Soldatov, D. V.; Enright, Gary D.; Ripmeester, John A.; Lipkowski, Janusz; Ukraintseva, E. A.

doi:10.1016/s1472-7862(02)00059-x

Cited by 15 publications

(6 citation statements)

References 49 publications

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“…Therefore, cooling might induce a better fit between a xenon atom and a sorption site and higher degree of guest ordering in the nanochannels. Phase transitions of this kind have been observed and studied in other inclusion compounds and may be induced by either temperature [64][65][66][67][68][69] or guest loading. 70,71 In a case of AI, the increase in entropy and decrease in q st might be a result of a stepwise increase in the channel diameter that takes place at a certain level of loading.…”

Section: Resultsmentioning

confidence: 99%

A New Approach to Characterizing Sorption in Materials with Flexible Micropores

et al. 2008

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Microporous dipeptides, also known as organic zeolites or biozeolites, as examples of small-pore peptide\ud nanotubes provide a convenient set of materials for developing a systematic approach based on 129Xe\ud NMR spectroscopy for the derivation of thermodynamic and molecular scale information on temperature\ud dependent pore filling. The sorption of xenon in the isolated 1D chiral nanochannels of eight microporous\ud dipeptides Ala-Val (AV), Val-Ala (VA), Leu-Ser (LS), Ala-Ile (AI), Val-Val (VV), Ile-Ala (IA), Ile-Val\ud (IV), Val-Ile (VI) (all LL isomers) was monitored in situ with continuous-flow 129Xe NMR spectroscopy\ud over a temperature range of 173-343 K. The materials all showed strongly anisotropic signals, with\ud isotropic chemical shift changing from 95 to 281 ppm depending on the dipeptide used and/or temperature.\ud The isosteric heats of sorption (qst) and entropy factors were determined from two independent models.\ud The sorption process was complicated by reversible phase transformations of some dipeptides and\ud irreversible changes due to aging of samples, both of which may be of considerable importance in\ud applications of soft materials. The interpretation of the line shapes and chemical shift anisotropy as a\ud function of temperature provided information on the structure of the xenon-cavity complex and made it\ud possible taking into account the helicity and flexibility of the nanochannels and the dynamics of xenon.\ud The approach illustrates a powerful way of analyzing pore space in soft microporous materials, yielding\ud a quantitative thermodynamic description of sorption and the characteristics of the pore space and sorption\ud events that occur on molecular-scale level during pore filling

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Section: Resultsmentioning

confidence: 99%

A New Approach to Characterizing Sorption in Materials with Flexible Micropores

et al. 2008

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“…As a result, the lanthanum complexes have different crystal structures. In virtually all cases the change in cell type or crystal system are due to the insertion of a specific ligand or guest, as well as the changing of the central metal ion [31]. The differences in space group of these complexes are not due to the differences in chain length of the PEG ligands, but are instead governed by the point symmetry and the crystal system.…”

Section: X-ray Studiesmentioning

confidence: 99%

“…Supramolecular materials that contain two or more components linked weakly by non-covalent interactions exhibit remarkable structural adaptability [31]. Compound II was shown to have greater chances of forming a supramolecular complex through abundant non-covalent interactions, namely intra-and intermolecular hydrogen bonds and also -interactions.…”

Section: X-ray Studiesmentioning

confidence: 99%

Coordination of trivalent lanthanum with polyethylene glycol in the presence of picrate anion: Spectroscopic and X-ray structural studies

Saleh

Kusrini

Saad

et al. 2009

Journal of Alloys and Compounds

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“…This is a new structure, but the metrics around Cu(II) are very similar to those in [Cu(Py) 4 (NO 3 ) 2 ] . 2Solv (Solv=Py, THF, CHCl 3 or C 6 H 6 ) (data in Table S2) [78,79] …”

Section: Resultsmentioning

confidence: 99%

Redox Instability of Copper(II) Complexes of a Triazine‐Based PNP Pincer

et al. 2021

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The new Cu(I) complex [Cu(PNP NTPh-Ph)Cl] (1) containing the tridentate PNP pincer ligand N,N'-bis(diphenylphosphino)-2,6diamino-4-phenyl-1,3,5-triazine was obtained from the reaction of [Cu(SMe 2)Cl] n with the ligand as ether solvate 1. 0.5Et 2 O. 1 was independently obtained from a reaction mixture containing the ligand and the Cu(II) precursor CuCl 2. 2H 2 O in 50 % yield alongside with the Cu(II) coordination polymer [Cu(O 2 PPh 2) 2 ] n (2). From the reaction of Cu(NO 3) 2 • 3H 2 O with PNP NTPh-Ph in the presence of pyridine the complexes [Cu(O 2 PPh 2) 2 (Py) 2 (H 2 O)] (3), [Cu(O 2 PPh 2)(Py) 2 (NO 3)] 2 (4), and [Cu(Py) 4 (NO 3) 2 ]. Py (5), were obtained, 2, 3, and 4 contain diphenyl-phosphinate ligands. The underlying redox reaction of the ligand and Cu(II) yielding the oxidised ligands observed in the by-products and the Cu(I) product complex was further studied using electrochemistry and UV-vis spectroelectrochemistry. Attempts to synthesise the Cu(II) complex [Cu(PNP NTPh-Ph)(NO 3) 2 ] (6) in a mechanochemical experiment gave evidence for this unprecedented species from ESI-MS(+) and EPR spectroscopy but also revealed its very high sensitivity to air and moisture. The catalytic activity of 1 was investigated in the azide-alkyne cycloaddition yielding various 1-benzyl-4-phenyl-1H-1,2,3-triazoles. The environmentally benign ("green") and cheap EtOH/H 2 O solvent mixture turned out to be very suitable. Melting points, FT-IR, and NMR spectra of the triazole products were analysed.

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Flexibility of soft supramolecular materials: polymorphous transition in the [Cu(pyridine)4(NO3)2]*2(pyridine) inclusion compound

Cited by 15 publications

References 49 publications

A New Approach to Characterizing Sorption in Materials with Flexible Micropores

A New Approach to Characterizing Sorption in Materials with Flexible Micropores

Coordination of trivalent lanthanum with polyethylene glycol in the presence of picrate anion: Spectroscopic and X-ray structural studies

Redox Instability of Copper(II) Complexes of a Triazine‐Based PNP Pincer

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