skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Tailoring the cavities of hydrogen-bonded amphidynamic crystals using weak contacts: towards faster molecular machines

Journal Article · · Chemical Science
DOI:https://doi.org/10.1039/d0sc05899h· OSTI ID:1811506

This work describes the use of C–H∙∙∙F–C contacts in the solid-state from the stator towards the rotator to fine-tune their internal motion, by constructing a set of interactions that generate close-fitting cavities in three supramolecular rotors 1–3I. The crystal structures of these rotors, determined by synchrotron radiation experiments at different temperatures, show the presence of such C–H∙∙∙F–C contacts between extended carbazole stators featuring fluorinated phenyl rings and the 1,4-diazabicyclo[2.2.2]octane (DABCO) rotator. According to the 2H NMR results, using deuterated samples, and periodic density functional theory computations, the rotators experience fast angular displacements (preferentially 120° jumps) due to their low rotational activation energies (Ea = 0.8–2.0 kcal mol-1). The higher rotational barrier for 1 (2.0 kcal mol-1) is associated with a larger number of weak C–H∙∙∙F–C contacts generated by the stators. This strategy offers the possibility to explore the correlation among weak intermolecular forces, cavity shape, and internal dynamics, which has strong implications in the design of future fine-tuned amphidynamic crystals.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES), Scientific User Facilities Division
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1811506
Journal Information:
Chemical Science, Vol. 12, Issue 6; ISSN 2041-6520
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

References (36)

Dynamic Characterization of Crystalline Supramolecular Rotors Assembled through Halogen Bonding journal December 2015
Concyclic CH-π arrays for single-axis rotations of a bowl in a tube journal September 2018
Rotational Dynamics of Diazabicyclo[2.2.2]octane in Isomorphous Halogen-Bonded Co-crystals: Entropic and Enthalpic Effects journal January 2017
Symmetry and dynamics of molecular rotors in amphidynamic molecular crystals journal August 2010
Design of Collective Motions from Synthetic Molecular Switches, Rotors, and Motors journal December 2019
Thermosalient Amphidynamic Molecular Machines: Motion at the Molecular and Macroscopic Scales journal October 2019
The calculation of molecular volumes and the use of volume analysis in the investigation of structured media and of solid-state organic reactivity journal August 1983
The NMR-WEBLAB: An internet approach to NMR lineshape analysis journal April 2001
Molecular Rotors in Porous Organic Frameworks journal January 2014
Improved Dynamic Properties of Charge-Transfer-Type Supramolecular Rotor Composed of Coronene and F 4 TCNQ journal October 2015
Understanding DABCO Nanorotor Dynamics in Isostructural Metal–Organic Frameworks journal February 2015
Hydrogen‐Bonded Crystalline Molecular Machines with Ultrafast Rotation and Displacive Phase Transitions journal August 2020
The Roles of Intrinsic Barriers and Crystal Fluidity in Determining the Dynamics of Crystalline Molecular Rotors and Molecular Machines journal May 2019
Electrochemical Switching of a Fluorescent Molecular Rotor Embedded within a Bistable Rotaxane journal May 2020
The Most Loose Crystals of Organic Compounds journal January 2013
Ultra-fast Rotors for Molecular Machines and Functional Materials via Halogen Bonding: Crystals of 1,4-Bis(iodoethynyl)bicyclo[2.2.2]octane with Distinct Gigahertz Rotation at Two Sites journal April 2011
Artificial Molecular Rotors journal April 2005
Enhanced Rotation by Ground State Destabilization in Amphidynamic Crystals of a Dipolar 2,3-Difluorophenylene Rotator as Established by Solid State 2 H NMR and Dielectric Spectroscopy journal June 2020
Mesomorphic [2]Rotaxanes: Sheltering Ionic Cores with Interlocking Components journal December 2012
Hirshfeld surface analysis journal January 2009
A General Theory of Magnetic Resonance Absorption journal November 1954
Bistable [ c 2] Daisy Chain Rotaxanes as Reversible Muscle-like Actuators in Mechanically Active Gels journal October 2017
Correlated motion and mechanical gearing in amphidynamic crystalline molecular machines journal January 2020
The hydrogen bond between N—H or O—H and organic fluorine: favourable yes, competitive no journal June 2017
Fast motion of molecular rotors in metal–organic framework struts at very low temperatures journal July 2020
Fluorine in crystal engineering—“the little atom that could” journal January 2005
Surface shape and curvature scales journal October 1992
Thermally Activated Transient Dipoles and Rotational Dynamics of Hydrogen-Bonded and Charge-Transferred Diazabicyclo [2.2.2]Octane Molecular Rotors journal September 2019
C–X···X–C vs C–H···X–C, Which One Is the More Dominant Interaction in Crystal Packing (X = Halogen)? journal August 2018
Metal–Organic Frameworks with Mechanically Interlocked Pillars: Controlling Ring Dynamics in the Solid-State via a Reversible Phase Change journal May 2014
It Isn’t, It Is: The C–H···X (X = O, N, F, Cl) Interaction Really Is Significant in Crystal Packing journal July 2016
Retarded Solid‐State Rotations of an Oval‐Shaped Guest in a Deformed Cylinder with CH–π Arrays journal July 2019
Static Modulation Wave of Arrays of Halogen Interactions Transduced to a Hierarchy of Nanoscale Change Stimuli of Crystalline Rotors Dynamics journal May 2018
Crystalline molecular machines: Encoding supramolecular dynamics into molecular structure journal July 2005
Mercury 4.0 : from visualization to analysis, design and prediction journal February 2020
Artificial molecular motors journal January 2017


Similar Records

Ultrafast rotation in an amphidynamic crystalline metal organic framework
Journal Article · Tue Dec 26 00:00:00 EST 2017 · Proceedings of the National Academy of Sciences of the United States of America · OSTI ID:1811506

Complex formation between excited-state saturated amines and water in n-hexane solution
Journal Article · Wed Jun 10 00:00:00 EDT 1987 · J. Am. Chem. Soc.; (United States) · OSTI ID:1811506

Syntheses of fluorescent thiocyanate supramolecular compounds with unusual two-dimensional structures
Journal Article · Sun May 15 00:00:00 EDT 2005 · Journal of Solid State Chemistry · OSTI ID:1811506