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Вацадзе, С. З.; Krainova, Yu. V.; Kovalkina, M. A.; Зык, Н. В.

doi:10.1023/a:1002820816850

Cited by 9 publications

(6 citation statements)

References 3 publications

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“…2 [bmim][BF 4 ] was obtained as a clear pale-yellow oily liquid in 71% yield with respect to the amount of 1-methylimidazole used. The 1 H and 13 C NMR spectra obtained for the products were consistent with those reported in the literature (11).…”

Section: Preparation Of the Ionic Liquidsupporting

confidence: 88%

Mannich Reactions in Room Temperature Ionic Liquids (RTILs): An Advanced Undergraduate Project of Green Chemistry and Structural Elucidation

et al. 2006

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Section: Preparation Of the Ionic Liquidsupporting

confidence: 88%

Mannich Reactions in Room Temperature Ionic Liquids (RTILs): An Advanced Undergraduate Project of Green Chemistry and Structural Elucidation

et al. 2006

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“…The ethanol and chloroform solutions were combined and the solvents removed by rotary evaporation to yield a semisolid which was subsequently recrystallized from ethanol (150 ml) to yield a second batch of colorless crystals. The product in each case was dried in vacuo (5 (3 times) to yield the product (1.74 g), an additional amount of which (0.33 g) could be obtained in the same manner from the mother liquor after one day in freezer. The product was air-dried and the total yield was 2.61 g (89 % 45 mmol) in ethanol (15 ml) was added to a stirred solution of 1b (1 g, 2.45 mmol) in chloroform (15 ml).…”

Section: Syntheses 14-bis(o-aminobenzyl)-14-diazacyclohexane (1a)mentioning

confidence: 99%

“…Some of our previous work on diazamono-and bicycles (piperazines; [3,4] homopiperazines; [5] bispidines [6,7] ) is already published. In the context of this challenge, we noted with interest the complexes of tetradentate piperazine-based ligands recently studied by Wieghardt and co-workers, [8] and further developed by us.…”

Section: Introductionmentioning

confidence: 99%

Piperazine-Based N4-Type 16-Membered Macroheterocycles and Their Nickel(II) Complexes

Вацадзе¹,

Krut’ko²,

Blake³

et al. 2017

MHC

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Square-planar diamagnetic nickel(II) complexes S. Z. Vatsadze et al. конформация сохраняется и в растворе, однако макроцикл оказался конформационно гибким -он подверга-ется вырожденной интерконверсии с активационным барьером 41.9±0.8 кДж/моль.Ключевые слова: 16-Членные макрогетероциклы, диамагнитные комплексы никеля(II), позитронно-эмиссионная томография, рентгеновская дифракция, ЯМР спектроскопия, конформационный анализ. one down), even for the four-coordinate complexes with no additional axial donor ligand(s). We envisaged that such a conformation might, in the long term, allow for asymmetric synthetic applications for metal-ligand multiply-bonded complexes containing such ligands. Finally, we noted that the coordination chemistry of piperazines [10,11] and their open-chain [8,[12][13][14][15][16] and macrocyclic [17][18][19][20][21][22][23] derivatives has only been developed for late transition metals.The coordination and supramolecular, as well as synthetic, chemistry of piperazine-based molecules is a currently emerging area. This activity is defined, first of all, by the conformational features of the piperazine ring. For example, in a recent paper Stucchi et al. reported the application of piperazine-based peptidomimetics.[24] Although Thirunarayanan et al. reported the complexation properties of piperazinophanes, [25] they did not adequately address the conformational behavior of the ring. The other direction of the application of piperazine-based ligands is the use of titanium complexes designed for the ring-opening polymerization of rac-lactide.[26] Piperazine-based macrocycles are known to form supramolecular tubular structures [27] and promising receptor-mimic phanes.[28]In the present work we have synthesized and studied the crystal and solution structures of two Cu(II) and four Ni(II) complexes with N 4 -type ligands (Figure 2).For 1a and 1b it has been shown that anilinic protons could be easily changed for SiMe 3 groups by the action of TMSCl/DABCO (trimethylsilyl chloride / 1,4-diazabicyclo-[2.2.2]octane).[9] The already-mentioned interesting feature of the ligands 1a and 1b in their Ni, Cu, Pd and Ti complexes studied so far, [8,9] is the non-planar, pseudo-C 2 symmetric (transoid) conformation that they adopt.Complexes 5a and 5b were included in this study because they contain the imine nitrogen that favors strong Ni-N bonding due to back-donation from Ni to the π* N=C orbital. Another feature of cyclic diimine ligands 4a and 4b is the rigid xylylidene bridge between imine nitrogens, which creates an additional reason for the cisoid conformation. This conformation is of particular interest for catalysis due to one

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“…In this article, we start to explore the series of diazabicycles as a central component of the potentially useful ligand families. Some of our previous work on diazamonocycles and bicycles have already been published (piperazines, − homopiperazines, bispidines, , ). A promising approach is to explore chelate (Figure , top and middle) and macrocycle (Figure , bottom) effects.…”

Section: Introductionmentioning

confidence: 99%

Copper–Bispidine Complexes: Synthesis and Complex Stability Study

et al. 2016

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A new series of dicarboxylic derivatives of bispidines have been synthesized to develop novel copper(II) complexes suitable as imaging agents for positron emission tomography. For characterization purposes, copper complexes of bispidines were synthesized in the pure form and in quantitative yields by neutralization of ligands with malachite. The formation of complexes and their stoichiometries were studied by potentiometric titration, cyclic voltammetry, and spectroscopic methods. The stability constants were found to be fairly suitable for copper cation fixation inside dianionic chelate molecules.

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Cited by 9 publications

References 3 publications

Mannich Reactions in Room Temperature Ionic Liquids (RTILs): An Advanced Undergraduate Project of Green Chemistry and Structural Elucidation

Mannich Reactions in Room Temperature Ionic Liquids (RTILs): An Advanced Undergraduate Project of Green Chemistry and Structural Elucidation

Piperazine-Based N4-Type 16-Membered Macroheterocycles and Their Nickel(II) Complexes

Copper–Bispidine Complexes: Synthesis and Complex Stability Study

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