Thermally Activated Tunneling Transition in a Photoswitchable Single-Molecule Electrical Junction

2017 ◽  
Vol 8 (13) ◽  
pp. 2849-2854 ◽  
Author(s):  
Na Xin ◽  
Chuancheng Jia ◽  
Jinying Wang ◽  
Shuopei Wang ◽  
Mingliang Li ◽  
...  
Keyword(s):  
Single Molecule ◽  
Thermally Activated ◽  
Tunneling Transition

scholarly journals New Silver(I) Coordination Polymer with Fe4 Single-Molecule Magnets as Long Spacer

2018 ◽  
Vol 4 (4) ◽  
pp. 43 ◽  
Author(s):  
Luca Rigamonti ◽  
Manuela Vaccari ◽  
Fabrizio Roncaglia ◽  
Carlo Baschieri ◽  
Alessandra Forni
Keyword(s):  
Coordination Polymer ◽  
Single Molecule ◽  
Building Blocks ◽  
Zero Field ◽  
Single Molecule Magnets ◽  
Long Distance ◽  
Linear Arrangement ◽  
Thermally Activated ◽  
Supramolecular Architectures ◽  
Donor Nitrogen

In continuation of our work on supramolecular architectures of single-molecule magnets (SMMs) as a promising strategy in developing their magnetic performance, in this paper we report the synthesis and single crystal X-ray structure of the centered triangular tetrairon(III) SMM, [Fe4(PhpPy)2(dpm)6], Fe4 (Hdpm = dipivaloylmethane, H3PhpPy = 2-(hydroxymethyl)-2-(4-(pyridine-4-yl)phenyl)propane-1,3-diol), and its assembly in the coordination polymer {[Fe4(PhpPy)2(dpm)6Ag](ClO4)}n, Fe4Ag, upon reaction with silver(I) perchlorate. Thanks to the presence of the pyridyl rings on the two tripodal ligands, Fe4 behaves as divergent ditopic linker, and due to the Fe4:AgClO4 1:1 ratio, Fe4Ag probably possesses a linear arrangement in which silver(I) ions are linearly coordinated by two nitrogen atoms, forming 1D chains whose positive charge is balanced by the perchlorate anions. The stabilization of such a polymeric structure can be ascribed to the long distance between the two donor nitrogen atoms (23.4 Å) and their donor power. Fe4Ag shows slow relaxation of the magnetization which follows a thermally activated process with Ueff/kB = 11.17(18) K, τ0 = 2.24(17) 10−7 s in zero field, and Ueff/kB = 14.49(5) K, τ0 = 3.88(8) 10−7 s in 1-kOe applied field, in line with what reported for tetrairon(III) SMMs acting as building blocks in polymeric structures.

Magnetic field and dilution effects on the slow relaxation of {Er3} triangle-based arsenotungstate single-molecule magnets

2020 ◽  
Vol 49 (35) ◽  
pp. 12458-12465 ◽  
Author(s):  
Hanhan Chen ◽  
Lin Sun ◽  
Jinpeng Zhang ◽  
Zikang Xiao ◽  
Pengtao Ma ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Single Molecule ◽  
Magnetic Relaxation ◽  
Slow Relaxation ◽  
Relaxation Processes ◽  
Single Molecule Magnets ◽  
Thermally Activated ◽  
Slow Magnetic Relaxation ◽  
Dilution Effects

Triangular {Er3} cluster containing POM exhibits field-induced two thermally activated relaxation processes. Whereas, the diamagnetic dilution sample indicates slow magnetic relaxation with the QTM being partially suppressed.

scholarly journals Internal strain drives spontaneous periodic buckling in collagen and regulates remodeling

2016 ◽  
Vol 113 (30) ◽  
pp. 8436-8441 ◽  
Author(s):  
Andrew Dittmore ◽  
Jonathan Silver ◽  
Susanta K. Sarkar ◽  
Barry Marmer ◽  
Gregory I. Goldberg ◽  
...  
Keyword(s):  
Single Molecule ◽  
Defect Formation ◽  
Internal Strain ◽  
Fibrillar Collagen ◽  
Self Healing ◽  
Cleavage Sites ◽  
Thermally Activated ◽  
Binding Regions ◽  
Collective Process ◽  
Regulatory Functions

Fibrillar collagen, an essential structural component of the extracellular matrix, is remarkably resistant to proteolysis, requiring specialized matrix metalloproteinases (MMPs) to initiate its remodeling. In the context of native fibrils, remodeling is poorly understood; MMPs have limited access to cleavage sites and are inhibited by tension on the fibril. Here, single-molecule recordings of fluorescently labeled MMPs reveal cleavage-vulnerable binding regions arrayed periodically at ∼1-µm intervals along collagen fibrils. Binding regions remain periodic even as they migrate on the fibril, indicating a collective process of thermally activated and self-healing defect formation. An internal strain relief model involving reversible structural rearrangements quantitatively reproduces the observed spatial patterning and fluctuations of defects and provides a mechanism for tension-dependent stabilization of fibrillar collagen. This work identifies internal–strain-driven defects that may have general and widespread regulatory functions in self-assembled biological filaments.

55Mn nuclear spin relaxation in the truly axial single-molecule magnet Mn12-t-butylacetate thermally-activated down to 400mK

Polyhedron ◽  
2007 ◽  
Vol 26 (9-11) ◽  
pp. 2320-2324 ◽  
Author(s):  
A.G. Harter ◽  
C. Lampropoulos ◽  
M. Murugesu ◽  
P. Kuhns ◽  
A. Reyes ◽  
...  
Keyword(s):  
Spin Relaxation ◽  
Single Molecule ◽  
Nuclear Spin ◽  
Nuclear Spin Relaxation ◽  
Single Molecule Magnet ◽  
Thermally Activated

Uncovering Single-Molecule Photophysical Heterogeneity of Bright, Thermally Activated Delayed Fluorescence Emitters Dispersed in Glassy Hosts

2016 ◽  
Vol 138 (41) ◽  
pp. 13551-13560 ◽  
Author(s):  
Rodrigo Noriega ◽  
Edward S. Barnard ◽  
Benedikt Ursprung ◽  
Benjamin L. Cotts ◽  
Samuel B. Penwell ◽  
...  
Keyword(s):  
Single Molecule ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated

scholarly journals Nanometer-Resolution Long-term Tracking of Single Cargos Reveals Dynein Motor Mechanisms

2022 ◽  
Author(s):  
Chunte Sam Peng ◽  
Yunxiang Zhang ◽  
Qian Liu ◽  
G. Edward Marti ◽  
Yu-Wen Alvin Huang ◽  
...  
Keyword(s):  
Single Molecule ◽  
Intracellular Transport ◽  
Molecular Model ◽  
Cytoplasmic Dynein ◽  
Single Particle Tracking ◽  
Thermally Activated ◽  
Dynein Motor ◽  
Biochemical Measurements ◽  
Hydrolysis Of

Cytoplasmic dynein is essential for intracellular transport, but because of its complexity, we still do not fully understand how this 1.5 megadalton protein works. Here, we used novel optical probes that enable single-particle tracking (SPT) of individual cargos transported by dynein motors in live neurons over 900 μm. Analyses using the Fluctuation Theorem (FT) showed that the number of dynein molecules switches between 1-5 motors during the transport. Clearly resolved single-molecular steps revealed that the dwell times between individual steps were accurately described by an enzymatic cycle dominated by two equal and thermally-activated rate constants. Based on these data, we propose a new molecular model whereby each step requires the hydrolysis of 2 ATPs. The model is consistent with extensive structural, single-molecule and biochemical measurements.

A novel oxime-derived 3d–4f single-molecule magnet exhibiting two single-ion magnetic relaxations

2016 ◽  
Vol 45 (29) ◽  
pp. 11876-11882 ◽  
Author(s):  
Hui-Ming Dong ◽  
Yan Li ◽  
Zhong-Yi Liu ◽  
En-Cui Yang ◽  
Xiao-Jun Zhao
Keyword(s):  
Single Molecule ◽  
Single Molecule Magnet ◽  
Thermally Activated ◽  
Weak Ferromagnetic

A weak ferromagnetic coupled {Dy4Ni6} cluster with a butterfly-shaped DyIII4 core and four-coordinate diamagnetic NiII ions shows field-induced SMM behaviour with two overlapping thermally activated relaxations.

Recent breakthroughs in thermally activated delayed fluorescence organic light emitting diodes containing non-doped emitting layers

2019 ◽  
Vol 7 (8) ◽  
pp. 2172-2198 ◽  
Author(s):  
Mallesham Godumala ◽  
Suna Choi ◽  
Min Ju Cho ◽  
Dong Hoon Choi
Keyword(s):  
Single Molecule ◽  
High Performance ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Emissive Layer ◽  
Thermally Activated ◽  
Device Stability ◽  
Organic Light

Despite the high performance of OLEDs consisting of host–guest blend systems in the emissive layer, OLEDs containing a single molecule as an emitter in the emissive layer (i.e. non-doped OLEDs) have significant advantages including easy fabrication procedures and enhanced device stability.

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