Hexanuclear iron(<scp>iii</scp>) α-aminophosphonate: synthesis, structure, and magnetic properties of a molecular wheel

Doroshenko, Iaroslav; Babiak, Michał; Buchholz, Axel; Plass, Winfried; Pinkas, Jiří

doi:10.1039/c7nj03606j

Cited by 10 publications

(5 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previously, there have been a few cyclic metal oxide carboxylate clusters with six-metal and eight-metal rings such as M 6 O 6 (M = Al 3+ , Fe 3+ , Ti 4+ ) − and M 8 O 8 (M = Fe 3+ , Cr 3+ , Al 3+ , Ti 4+ ). − However, those with a seven-metal Ti 7 O 7 ring, such as the current Ti 7 Cr 14 host, are much less . Meanwhile, the hierarchical and concentric arrangement of Ti 7 O 7 and Cr 14 O 14 rings is unique.…”

Section: Resultsmentioning

confidence: 99%

Cr–Ti Mixed Oxide Molecular Cages: Synthesis, Structure, Photoresponse, and Photocatalytic Properties

et al. 2022

View full text Add to dashboard Cite

The solvothermal reaction of titanium isopropoxide and chromate in the presence of benzoate produced two novel host−guest clusters encapsulating Cs + or H 3 O + , (H 3 O)@Ti 7 Cr 14 and Cs@Ti 7 Cr 14 . The most remarkable feature is that the Ti 7 O 7 ring is concentrically embraced by a Cr 14 O 14 ring to form a rigid Ti 7 Cr 14 host. ESI-MS and 133 Cs NMR revealed that the overall framework structures are preserved, whereas the benzoate ligands on the two clusters may be labile in solutions. Both (H 3 O)@ Ti 7 Cr 14 and Cs@Ti 7 Cr 14 exhibit good UV−vis light-responsive properties and photocatalytic activities, with absorption edges extending up to 780 nm. Cs@Ti 7 Cr 14 is an effective visible-lightresponsive photocatalyst in both the heterogeneous methylene dye degradation and homogeneous CO 2 cycloaddition reaction under mild conditions like room temperature and 1 bar of CO 2 . According to the mechanism studies, Cs + , as a rigid guest, can significantly improve the photogenerated charge separation efficiency of the Ti 7 Cr 14 host, thereby improving its interface charge separation properties, photocurrent, and photocatalytic activities. Our findings not only provide new members of heterometallic titanium oxide clusters to enrich the metal oxide cluster family but also open up new possibilities for their photoresponses, which may play an important role in solar energy harvesting for sustainable chemistry.

show abstract

Section: Resultsmentioning

confidence: 99%

Cr–Ti Mixed Oxide Molecular Cages: Synthesis, Structure, Photoresponse, and Photocatalytic Properties

et al. 2022

View full text Add to dashboard Cite

show abstract

“…As shown in Figure 3a for 1, one quadrupole doublet is observed at 100 K, with Mossbauer parameters of δ (isomer shift) = 0.43 and ΔE Q (quadrupole splitting) = 0.58 mm s −1 , demonstrating that the Fe II ions are oxidized as HS Fe III analogues. 49,50 However, two quadrupole doublets are observed for 2 (Figure 3b): one is characteristic of the HS Fe III species with Mossbauer parameters of δ = 0.44 and ΔE Q = 0.43 mm s −1 , and the other is attributed to the HS Fe II species with δ = 1.26 and ΔE Q = 2.71 mm s −1 . 51,52 The Fe III /Fe II peak area ratio is 0.66/ 0.34, confirmed two Fe III ions and one Fe II ion in the structure of 2.…”

mentioning

confidence: 99%

Optimizing the Proton Conductivity of Fe-Diphosphonates by Increasing the Relative Number of Protons and Carrier Densities

Jiang

et al. 2020

Inorg. Chem.

View full text Add to dashboard Cite

Proton conductive materials have attracted extensive interest in recent years due to their fascinating applications in sensors, batteries, and proton exchange membrane fuel cells. Herein, two Fe-diphosphonate chains (H4-BAPEN)0.5·[FeIII(H-HEDP)(HEDP)0.5(H2O)] (1) and (H4-TETA)2·[FeIII 2FeII(H-HEDP)2(HEDP)2(OH)2]·2H2O (2) (HEDP = 1-hydroxyethylidenediphosphonate, BAPEN = 1,2-bis(3-aminopropylamino)ethane, and TETA = triethylenetetramine) with different templating agents were prepared by hydrothermal reactions. The valence states of the Fe centers were demonstrated by 57Fe Mössbauer spectra at 100 K, with a high-spin FeIII state for 1 and mixed high-spin FeIII/FeII states for 2. Their magnetic properties were determined, which featured strong antiferromagnetic couplings in the chain. Importantly, the proton conductivity of both compounds at 100% relative humidity was explored at different temperatures, with 2.79 × 10–4 S cm–1 at 80 °C for 1 and 7.55 × 10–4 S cm–1 at 45 °C for 2, respectively. This work provides an opportunity for improving proton conductive properties by increasing the relative number of protons and the carrier density using protonated flexible aliphatic amines.

show abstract

“…Coordination chemistry provides an opportunity for construction by self-assembling an apparently limitless variety of structures [1,2]. Specifically, the construction of the supramolecular coordination chemistry of transition metal complexes has received much attention over the last couple of decades, due to their vital roles in biology [3][4][5], catalysis [6,7], and more importantly, in magneto-chemistry [8][9][10][11][12][13][14]. In this context, polytopic threefold symmetric ligands based on triaminoguanidine are of particular interest in crystal engineering and supramolecular chemistry [15][16][17][18] due to their structural diversity and the chemical versatility of the resulting systems [19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

A Cu12 Metallacycle Assembled from Four C3-Symmetric Spin Frustrated Triangular Units

et al. 2023

Self Cite

View full text Add to dashboard Cite

Assembling metallacycles with interesting topological arrangements is a critical task for chemists. We report here a novel dodecanuclear CuII compound, [{Cu3L(µ-N3)}4(Py)14]·2Py (Cu12) (where Py = pyridine and [H6L]Cl = tris(2-hydroxybenzylidine)triaminoguanidinium chloride, respectively), with the topology of a cycle accomplished by four two-connecting approximately flat C3-symmetric guanidine-based ligands. Each ligand affords three tridentate metal-binding cavities and the four node-to-node connections through single azido bridges are provided by pairs of metal centers. A theoretical investigation using CASSCF in addition to DFT calculations showed strong antiferromagnetic coupling within the Cu3-triangles, resulting in spin-frustrated systems. However, these calculations were not able to properly reproduce the very weak antiferromagnetic couplings between the triangle units, highlighting the challenge of describing the magnetic behavior of this compound.

show abstract

Hexanuclear iron(iii) α-aminophosphonate: synthesis, structure, and magnetic properties of a molecular wheel

Abstract: A new hexanuclear molecular iron phosphonate complex, [Fe6(HAIPA)12(OH)6]·nH2O (1·nH2O) (H2AIPA = NH2(CH3)2CP(O)(OH)2, (2-aminopropan-2-yl)phosphonic acid), was synthesized from Fe2+ and Fe3+ salts in water by interaction with the ligand sodium salt.

Cited by 10 publications

References 35 publications

Cr–Ti Mixed Oxide Molecular Cages: Synthesis, Structure, Photoresponse, and Photocatalytic Properties

Cr–Ti Mixed Oxide Molecular Cages: Synthesis, Structure, Photoresponse, and Photocatalytic Properties

Optimizing the Proton Conductivity of Fe-Diphosphonates by Increasing the Relative Number of Protons and Carrier Densities

A Cu12 Metallacycle Assembled from Four C3-Symmetric Spin Frustrated Triangular Units

Contact Info

Product

Resources

About