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Various Sizes and Shapes of Mixed-Anion Fe(NHtrz)(BF)(SiF)@SiO Nanohybrid Particles Undergoing Spin Crossover Just Above Room Temperature.
Nanomaterials (Basel)
January 2025
Laboratoire de Chimie de Coordination, CNRS & Université de Toulouse (UPS, INP), 31077 Toulouse, France.
Spin crossover (SCO) iron (II) coordination compounds in the form of nanohybrid SCO@SiO particles were prepared using a reverse micelles technique based on the TritonX-100/cyclohexane/water ternary system. Tetraethyl orthosilicate (TEOS) acts as precursor of both the SiF counter-anion and SiO to obtain Fe(NHtrz)(BF)(SiF)@SiO nanoparticles with different sizes and morphologies while modifying the TEOS concentration and reaction time. The adjustable mixed-anion strategy leads to a range of quite scarce abrupt spin crossover behaviors with hysteresis just above room temperature (ca.
View Article and Find Full Text PDFConversion of Flexible Spin Crossover Metal-Organic Frameworks Macrocrystals to Nanocrystals Using Ultrasound Energy: A Study on Structural Integrity by MicroED and Charge-Transport Properties.
Small
December 2024
IMDEA Nanociencia, Ciudad Universitaria de Cantoblanco, C/ Faraday 9, Madrid, 28049, Spain.
Metal-Organic Frameworks (MOFs) attract attention for their intrinsic porosity, large surface area, and functional versatility. To fully utilize their potential in applications requiring precise control at smaller scales, it is essential to overcome challenges associated with their bulk form. This is particularly difficult for 3D MOFs with spin crossover (SCO) behavior, which undergo a reversible transition between high-spin and low-spin states in response to external stimuli.
View Article and Find Full Text PDFEffect of different crystallographic properties on the electrical conductivity of two polymorphs of a spin crossover complex.
J Phys Condens Matter
December 2024
Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, 900 N 16th St., Lincoln, NE 68588, United States of America.
Article Synopsis
- This study compares two forms of the iron(II) triazole spin crossover complex—nanoparticles and nanorods—in terms of their structure and electrical conductivity.
- Conductive atomic force microscopy revealed that the nanorods exhibited significantly higher conductivity than the nanoparticles, which is linked to their different Fe-N bond lengths.
- Transport measurements indicated that the nanorods have the highest conductance in a low spin state at 320 K when in the dark, while illuminated conditions showed a reduced change in conductance.
Optical imaging of the stochastic nucleation kinetics and intrinsic activation energy of single spin-crossover nanoparticles.
Proc Natl Acad Sci U S A
November 2024
State Key Laboratory of Analytical Chemistry for Life Science, Chemistry and Biomedicine Innovation Center, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.
Cooperative spin crossover (SCO) compounds are one of the most promising molecular bistable solids due to their intriguing thermal hysteresis phenomena around room temperature. It is well known that hysteresis is an essential kinetic effect, however, accurate assessment of the spin transition kinetics of SCO nanomaterials remains scarce. Herein, we developed a thermal-optical methodology to image the thermally induced spin transition kinetics of single SCO nanoparticles in a quantitative, repeatable, and high-throughput manner.
View Article and Find Full Text PDFSize and Surface Effects in the Ultrafast Dynamics of Strongly Cooperative Spin-Crossover Nanoparticles.
Small
January 2025
Department of Chemistry, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA.
Cooperative photoinduced switching of molecular materials at the nanoscale is still in its infancy. Strongly cooperative spin-crossover nanomaterials are arguably the best prototypes of photomagnetic and volume-changing materials that can be manipulated by short pulses of light. Open questions remain regarding their non-equilibrium dynamics upon light excitation and the role of cooperative elastic interactions in nanoscale systems that are characterized by large surface/volume ratios.
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