Old materials with new tricks: multifunctional open-framework materials

Maspoch, Daniel; Ruiz‐Molina, Daniel; Veciana, Jaume

doi:10.1039/b501600m

Cited by 1,047 publications

(509 citation statements)

References 654 publications

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“…This characteristic led us to prepare guest‐induced switching materials associated with the N–I phase transition, as reported for some porous coordination polymers (PCPs) in terms of spin states,23, 24, 25 electrical conductivity,26, 27 and magnetic ordering 28, 29, 30, 31, 32, 33, 34, 35…”

Section: Resultsmentioning

confidence: 87%

Magnetic Sponge with Neutral–Ionic Phase Transitions

et al. 2017

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Phase transitions caused by the charge instability between the neutral and ionic phases of compounds, i.e., N–I phase transitions, provide avenues for switching the intrinsic properties of compounds related to electron/spin correlation and dipole generation as well as charge distribution. However, it is extremely difficult to control the transition temperature (T c) for the N–I phase transition, and only chemical modification based on the original material have been investigated. Here, a design overview of the tuning of N–I phase transition by interstitial guest molecules is presented. This study reports a new chain coordination‐polymer [Ru2(3,4‐Cl2PhCO2)4TCNQ(EtO)2]∙DCE (1‐DCE; 3,4‐Cl2PhCO2 − = 3,4‐dichlorobenzoate; TCNQ(EtO)2 2,5‐diethoxy‐7,7,8,8‐tetracyanoquinodimethane; and DCE = 1,2‐dichloroethane) that exhibits a one‐step N–I transition at 230 K (= T c) with the N‐ and I‐states possessing a simple paramagnetic state and a ferrimagnetically correlated state for the high‐ and low‐temperature phases, respectively. The T c continuously decreases depending on the content of DCE, which eventually disappears with the complete evacuation of DCE, affording solvent‐free compound 1 with the N‐state in the entire temperature range (this behavior is reversible). This is an example of tuning the in situ T c for the N–I phase transition via the control of the interstitial guest molecules.

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Section: Resultsmentioning

confidence: 87%

Magnetic Sponge with Neutral–Ionic Phase Transitions

et al. 2017

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“…1). 2 (1) Compound 1 crystallizes in the triclinic space group P1 with Z = 1 formula units in the unit cell (see Table 7). The asymmetric unit consists of one Ba cation, two thiocyanato anions, one bpe ligand and six water molecules in general positions, as well as two bpe ligands that are located on centers of inversion.…”

Section: Synthetic Aspectsmentioning

confidence: 99%

“…Recently, investigations on the synthesis, structures and properties of coordination compounds have become of increasing interest [1][2][3][4][5][6][7]. In this context, compounds with condensed networks, in which paramagnetic metal atoms are linked by small-sized anionic ligands are of special interest because of their diverse magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Crystal Structures and Properties of New Barium Thiocyanato Coordination Polymers with trans-1,2-Bis(4-pyridyl)ethylene as Ligand

Wöhlert

Jeß

Näther

2011

Zeitschrift Für Naturforschung B

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Reactions of barium thiocyanate with trans-1,2-bis(4-pyridyl)ethylene (bpe) in acetonitrile/water using different molar ratios always lead to the formation of a new barium coordination polymer of composition { [[Ba(NCS). During the preparation of single crystals of compound 1, three additional new compounds were obtained (2 -4), of which one crystallizes in two different polymorphic modifications (4I and 4II). In compound 1 the Ba cations are coordinated by six water molecules, two N-bonding thiocyanato anions and one N atom of a bpe ligand within an irregular polyhedron. Two Ba cations are linked by two water molecules and two μ-1,1-N-bridging thiocyanato anions into centrosymmetric dimers that are further connected by the bpe ligands into chains. The coordination topology in the crystal structure of compound 2 is very similar to that in 1 in that two coordinating water molecules are exchanged by two terminal bpe ligands. As in 1, Ba dimers are observed that are connected by the bpe ligands into chains. In [[Ba(NCS) 2 ] 2 ]-(bpe) 3 (3) the barium cations are linked by two μ-1,3-bridging anions and one side-on-bridging thiocyanato anion into chains that are further linked by the bpe ligands into layers. In the first polymorphic modification of composition [Ba(NCS) 2 (bpe)(H 2 O)(CH 3 CN)]CH 3 CN (4I) each Ba cation is coordinated by one terminal N-bonding and two μ-1,1,3(N,N ,S)-bridging thiocyanato anions, two bridging water molecules, one acetonitrile molecule and one bpe ligand within an irregular polyhedron. The Ba cations are connected into chains that are further linked via O-H···N hydrogen bonding. The crystal structure of the second form 4II is very similar to that of form 4I, and significant differences are found predominantly in the packing of the complexes. Investigations using simultaneous differential thermoanalysis and thermogravimetry on compound 1 have shown that this compound decomposes in three steps with the formation of compound 3 in the second TG step.

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“…In particular, A=K materials with divalent cations (Zn, Pd, Cd, Sr) were characterized [1][2][3][4]. These and other related diphosphates have awaked great interest in relation to their potential technological applications, as some of them may have magnetic and useful catalytic properties [5][6][7]. Besides, some of them have been proposed as cathode materials for lithium batteries [8,9] and even, as nanoparticles, for decontamination and remediation of water [10].…”

Section: Introductionmentioning

confidence: 99%

Electrical conduction and thermodynamic properties of K2NiP2O7

Said

Louati

Guidara

2013

Ionics

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The pyrophosphate K 2 NiP 2 O 7 has been synthesized by the classic ceramic method and characterized by Xray diffraction, solid-state 31 P magic angle spinning (MAS) NMR, and IR and electrical impedance spectroscopy. The solid-state 31 P MAS NMR, performed at 121.49 MHz, shows two isotropic resonances at −17.66 and −19.94 ppm, revealing the existence of two phosphorus environments in the structure. The electrical conductivity and dielectric properties have been investigated in the frequency and the temperature range of 200 Hz-1 MHz and 603-728 K, respectively. The frequency dependence of the conductivity is interpreted using the augmented Jonscher relation. The close values of activation energies obtained from the analysis of hopping frequency and dc conductivity imply that the transport is through ion hopping mechanism. The charge carrier concentration in the investigated sample has been evaluated using the Almond-West formalism and shown to be independent of temperature. Thermodynamic parameters such as the free energy of activation ΔF, the enthalpy ΔH , and the change in entropy ΔS have been calculated.

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Old materials with new tricks: multifunctional open-framework materials

Cited by 1,047 publications

References 654 publications

Magnetic Sponge with Neutral–Ionic Phase Transitions

Magnetic Sponge with Neutral–Ionic Phase Transitions

Synthesis, Crystal Structures and Properties of New Barium Thiocyanato Coordination Polymers with trans-1,2-Bis(4-pyridyl)ethylene as Ligand

Electrical conduction and thermodynamic properties of K2NiP2O7

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