Preparation, crystal structure, vibrational spectra and thermal behaviour of piperazinium(2+) selenite monohydrate and piperazinium(2+) diselenite

Havlı́ček, David; Chudoba, Vı́t; Němec, Ivan; Cı́sařová, Ivana; Mička, Zdeněk

doi:10.1016/s0022-2860(01)00857-2

Cited by 36 publications

(2 citation statements)

References 16 publications

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“…The title compound 1,4-diazabicyclo[2.2.2]octane-1,4-diium dihydrogen phosphate monohydrate (I) belongs to the group of substances based on the salts of oxo-acids and nitrogen-containing organic bases, which could have interesting physical properties originating from the presence of various hydrogen bonds, whose arrangement and energies are crucial for this type of proton conductors. Till this time synthesis, properties and crystal structures of several new salts, where the anions were selenite, hydrogen selenite, diselenite, selenate, hydrogen selenate, phosphate, hydrogen phosphate and dihydrogen phosphate and the cations piperazinium and N,N 0 -dimethylpiperazinium (Havlíček et al, 2000;Němec et al, 2001;Havlíček et al, 2002;Plocek et al, 2003), ethanediammonium, 1,3-propanediammonium and 1,4-butanediammonium have been studied, but it was just the compound (I), which showed the structure with some unique features and has also provided nonlinear dependence of the current on the voltage in DC measurement. This apparent discrepancy with the Ohm's law is connected with charge transfer resistance of the proton conducting sample, where a rectified transport of protons released from the own structure is followed by their transport near the surface and heterogeneous electron transfer.…”

Section: Introductionmentioning

confidence: 99%

1,4-diazabicyclo[2.2.2]octane-1,4-diium dihydrogen phosphate monohydrate from X-ray and neutron data

Smrčok¹,

Havlı́ček²,

Kaman³

et al. 2009

Zeitschrift Für Kristallographie

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Dihydrogen phosphate / Proton conductivity / Single crystal structure analysis / Neutron diffraction Abstract. The three-dimensional skeleton of the structure of the title compound is formed by the chains of the hydrogen phosphate units running approximately parallel to the c-axis. The units are coupled to the chains by three types of hydrogen bonds: strong symmetric O--H--O (O . . . O ¼ 2.424(4) and 2.425(4) A) and the moderate P--O--H . . . O--P and P--O . . . (H 2 O) . . . O--P, respectively. Molecules of the doubly protonated 1,4-diazabicyclo[2.2.2]octane moieties are placed in the voids and in addition for electrostatic interactions they are also hydrogen bonded to the chains of PO 4 tetrahedra. The DC conductivity measured at the room temperature along the baxis is very low (% 7 Â 10 À11 S cm À1 ), while in the perpendicular plane it is for more than two or three orders higher and the nonlinear current vs. potential dependence was registered.

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Section: Introductionmentioning

confidence: 99%

1,4-diazabicyclo[2.2.2]octane-1,4-diium dihydrogen phosphate monohydrate from X-ray and neutron data

Smrčok¹,

Havlı́ček²,

Kaman³

et al. 2009

Zeitschrift Für Kristallographie

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“…In the reaction, the stronger phosphorous acid was able to transfer its acidic protons to piperazine to protonate both nitrogen atoms and create the piperazinium dication. This dication has been observed in different organic and inorganic structures [47][48][49][50][51][52] and has been previously used as an organic templating agent [53]. In the structure of (1), the nitrogen protons (H1A and H1B) on the piperazinium both showed strong hydrogen bonding to O(2) on the phosphite anion at ~1.89 Å each.…”

Section: Methodsmentioning

confidence: 83%

New Uranyl Open Framework and Sheet Compounds Formed via In-Situ Protonation of Piperazine by Phosphorous Acid

2018

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Two new uranyl compounds were hydrothermally synthesized employing piperazine as an organic templating agent. The piperazine was protonated in-situ by phosphorous acid, forming the piperazinium dication featured in these compounds. The two new structures presented here are a uranyl phosphite 2D sheet and a 3D uranyl mixed phosphite–phosphate network with cation occupied channels. Both included strong hydrogen bonding from the piperazinium cation to the uranyl phosphite or mixed phosphite–phosphate network. These two structures can be reliably formed through careful control of pH of the starting solution and the reaction duration. The piperazinium uranyl phosphite compound was the latest in a family of uranyl phosphites, and demonstrates the structural versatility of this combination. The mixed phosphite–phosphate compound builds on hydrothermal redox chemistry, illustrating the variety of compounds that can be isolated by exploiting in-situ redox processes to elucidate new uranium structure types.

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Chalcogen and Hydrogen Bond Team up in Driving Anion⋅⋅⋅Anion Self‐Assembly

Beccaria,

Dhaka,

Calabrese

et al. 2023

Chemistry A European J

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H‐selenite anions (HSeO3−) form in the solid unprecedented anionic supramolecular chains wherein single units are assembled via alternating short Se⋅⋅⋅O and H⋅⋅⋅O contacts. Crystallographic analyses and computational studies (the quantum theory of “atoms‐in‐molecules”, QTAIM, and the noncovalent interaction plot, NCIPlot) consistently prove the attractive nature of these chalcogen bonds (ChBs) and hydrogen honds (HBs), the Janus‐type character of HSeO3− anions which act as both donors and acceptors of ChB and HB, and the possible stability of anion dimers in solution. The effectiveness of the ChBs herein described may lead to consider the HSeO3− moiety as a new entry in the toolbox of crystal engineering based on ChB.

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Preparation, crystal structure, vibrational spectra and thermal behaviour of piperazinium(2+) selenite monohydrate and piperazinium(2+) diselenite

Cited by 36 publications

References 16 publications

1,4-diazabicyclo[2.2.2]octane-1,4-diium dihydrogen phosphate monohydrate from X-ray and neutron data

1,4-diazabicyclo[2.2.2]octane-1,4-diium dihydrogen phosphate monohydrate from X-ray and neutron data

New Uranyl Open Framework and Sheet Compounds Formed via In-Situ Protonation of Piperazine by Phosphorous Acid

Chalcogen and Hydrogen Bond Team up in Driving Anion⋅⋅⋅Anion Self‐Assembly

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