Hydrophobicity‐Driven Self‐Assembly of an Eighteen‐Membered Honeycomb Lattice with Almost Classical Spins

Abstract

The design and synthesis of model compounds that do not exist naturally is one of the important targets in modern coordination chemistry. Herein, an eighteen-membered honeycomb structure with equal numbers of Mn (s=5/2) and Gd (s=7/2) metal centers has been prepared, for the first time, by using a hydrophobic force-directed self-assembling process. Due to the weakly coupled Gd pairs, the magnetic properties are mainly determined by eight-membered chains in the experimentally considered temperature range. These [Mn Gd ] "finite-size" chains, albeit with large Hilbert space, can be fully resolved by the high-temperature series expansion and the powerful finite-temperature Lanczos method, which reveal that the exchange-couplings between the metal centers are antiferromagnetic and consistent with the magnetization measurement. Interestingly, from the surface-engineering point of view, the [Mn Gd ] chains are "precisely" assembled into a 2D honeycomb pattern, which is potentially desirable in the design of weakly coupled qubits.

Transition Metal Coordination Polymers with Trans-1,4-Cyclohexanedicarboxylate: Acidity-Controlled Synthesis, Structures and Properties

“…An asymmetric unit of [Co(H 2 O) 4 (chdc)] n (1) contains one Co atom, which has an octahedral coordination environment of four aqua ligands and two O atoms of two COO-groups, which are situated in trans positions (Figure 1). Co-OH 2 distances are 2.0947(9) Å and 2.1168 (10) (11)) and hydrophobic interactions between cyclohexane rings play an important role in the formation of the dense phase. The smallest interlayer H CH ...H CH distance is calculated to be 2.320 Å, which indicates a close linker-to-linker packing in 1.…”

“…Translating along the a and b axis, the decanuclear rings tile (004) plane to form polymeric layer with hexagonal topology (Figure 3b). Such a structure is unique for metal-organic frameworks, although there are reported examples of manganese or iron MOFs, which are constructed of endotemplated "honeycombs" with a different size or metal rings [10,11,33,34]. The layers alternate along the c axis, interconnecting by bridging chdc 2− ligands to form 3D metal-organic framework (see also Figures S6 and S7).…”

“…[5][6][7][8], which are often hard to rationalize. More efforts are required to prepare new aliphatic-based MOFs, however, the successful syntheses could lead to unusual crystal structures as a result of hydrophobic interactions between aliphatic moieties and their unique effect on the crystal packing [9][10][11]. An increased conformational lability of organic blocks provides ligand-driven structural Materials 2020, 13, 486 2 of 16 transitions in the corresponding porous networks, including reversible breathing phenomena [12][13][14][15][16].…”

Nivel de satisfacción sobre la seguridad y complicaciones a cuatro años de la introducción de la técnica Microelectrólisis Percutánea (MEP®) Sport como práctica fisioterapéutica

“…This inflammation would appear to be caused by the shearing movements that occur in the tendon that appear during eccentric work 17 . Significant results of MEP® have also been found in trigger points 18 .…”

Recent advances in structures and applications of coordination polymers based on cyclohexanepolycarboxylate ligands

“…Although 1-CHC has only one carboxylate group, higher dimensional CPs can be constructed via different coordination modes of carboxylate groups. For example, Zheng et al 23 showed two 1D chain precursors, [Gd 2 (1-CHC) 5 (OH)(H 2 O)] n and [Mn 4 (1-CHC) 8 (1H-CHC) 2 ] n , and one 2D eighteen-membered honeycomb lattice CP [Gd 2 Mn 2 (1-CHC) 10 (H 2 O)] n . In the formation of 1D chain, the Gd ions are connected by 1-CHC in chelating, bridging mode VI, whereas the Mn ions are united in three coordination modes, IV, V and VI.…”