Large electric-field-induced strain in centrosymmetric crystals of a dipolar ruthenium alkynyl complex

K. Lau; A. Barlow; G. J. Moxey; Q. Li; Y. Liu; M. G. Humphrey; M. P. Cifuentes; T. J. Frankcombe; R. Stranger

doi:10.1039/c5cp00528k

Large electric-field-induced strain in centrosymmetric crystals of a dipolar ruthenium alkynyl complex

K. Lau, A. Barlow, G. J. Moxey, Q. Li, Y. Liu^*, M. G. Humphrey, M. P. Cifuentes, T. J. Frankcombe, R. Stranger

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Dipolar molecular crystals present different physical properties from traditionally strongly correlated ionic solid-state inorganic crystals due to the weak intermolecular bonding. Herein, centrosymmetric dipolar molecular crystals of the organoruthenium complex trans-[Ru(C≡CC₆H₄-4-NO₂)(C≡CPh)(dppe)₂] [dppe = 1,2-bis(diphenylphosphino)ethane] display a large electric-field-induced strain behaving differently from conventional piezoelectric materials that must, structurally, be noncentrosymmetric. Further studies of related systematically varied crystalline organoruthenium complexes reveal that the strong electromechanical coupling effect is not from classical ferroelectricity, electrostriction, flexoelectricity or electrochemical strain. It is, instead, attributed to the disorder in the molecular packing, which facilitates reorientation of the molecular dipoles under the action of an applied electric field. This provides a fresh insight into the design and development of new functional materials and a promising source of electromechanical coupling in organometallic, and more generally dipolar molecular, crystals.

Original language	English
Pages (from-to)	10781-10785
Number of pages	5
Journal	Physical Chemistry Chemical Physics
Volume	17
Issue number	16
DOIs	https://doi.org/10.1039/c5cp00528k
Publication status	Published - 28 Apr 2015

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title = "Large electric-field-induced strain in centrosymmetric crystals of a dipolar ruthenium alkynyl complex",

abstract = "Dipolar molecular crystals present different physical properties from traditionally strongly correlated ionic solid-state inorganic crystals due to the weak intermolecular bonding. Herein, centrosymmetric dipolar molecular crystals of the organoruthenium complex trans-[Ru(C≡CC6H4-4-NO2)(C≡CPh)(dppe)2] [dppe = 1,2-bis(diphenylphosphino)ethane] display a large electric-field-induced strain behaving differently from conventional piezoelectric materials that must, structurally, be noncentrosymmetric. Further studies of related systematically varied crystalline organoruthenium complexes reveal that the strong electromechanical coupling effect is not from classical ferroelectricity, electrostriction, flexoelectricity or electrochemical strain. It is, instead, attributed to the disorder in the molecular packing, which facilitates reorientation of the molecular dipoles under the action of an applied electric field. This provides a fresh insight into the design and development of new functional materials and a promising source of electromechanical coupling in organometallic, and more generally dipolar molecular, crystals.",

author = "K. Lau and A. Barlow and Moxey, {G. J.} and Q. Li and Y. Liu and Humphrey, {M. G.} and Cifuentes, {M. P.} and Frankcombe, {T. J.} and R. Stranger",

note = "Publisher Copyright: {\textcopyright} the Owner Societies 2015.",

year = "2015",

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day = "28",

doi = "10.1039/c5cp00528k",

language = "English",

volume = "17",

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T1 - Large electric-field-induced strain in centrosymmetric crystals of a dipolar ruthenium alkynyl complex

AU - Lau, K.

AU - Barlow, A.

AU - Moxey, G. J.

AU - Li, Q.

AU - Liu, Y.

AU - Humphrey, M. G.

AU - Cifuentes, M. P.

AU - Frankcombe, T. J.

AU - Stranger, R.

PY - 2015/4/28

Y1 - 2015/4/28

N2 - Dipolar molecular crystals present different physical properties from traditionally strongly correlated ionic solid-state inorganic crystals due to the weak intermolecular bonding. Herein, centrosymmetric dipolar molecular crystals of the organoruthenium complex trans-[Ru(C≡CC6H4-4-NO2)(C≡CPh)(dppe)2] [dppe = 1,2-bis(diphenylphosphino)ethane] display a large electric-field-induced strain behaving differently from conventional piezoelectric materials that must, structurally, be noncentrosymmetric. Further studies of related systematically varied crystalline organoruthenium complexes reveal that the strong electromechanical coupling effect is not from classical ferroelectricity, electrostriction, flexoelectricity or electrochemical strain. It is, instead, attributed to the disorder in the molecular packing, which facilitates reorientation of the molecular dipoles under the action of an applied electric field. This provides a fresh insight into the design and development of new functional materials and a promising source of electromechanical coupling in organometallic, and more generally dipolar molecular, crystals.

AB - Dipolar molecular crystals present different physical properties from traditionally strongly correlated ionic solid-state inorganic crystals due to the weak intermolecular bonding. Herein, centrosymmetric dipolar molecular crystals of the organoruthenium complex trans-[Ru(C≡CC6H4-4-NO2)(C≡CPh)(dppe)2] [dppe = 1,2-bis(diphenylphosphino)ethane] display a large electric-field-induced strain behaving differently from conventional piezoelectric materials that must, structurally, be noncentrosymmetric. Further studies of related systematically varied crystalline organoruthenium complexes reveal that the strong electromechanical coupling effect is not from classical ferroelectricity, electrostriction, flexoelectricity or electrochemical strain. It is, instead, attributed to the disorder in the molecular packing, which facilitates reorientation of the molecular dipoles under the action of an applied electric field. This provides a fresh insight into the design and development of new functional materials and a promising source of electromechanical coupling in organometallic, and more generally dipolar molecular, crystals.

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U2 - 10.1039/c5cp00528k

DO - 10.1039/c5cp00528k

M3 - Article

SN - 1463-9076

VL - 17

SP - 10781

EP - 10785

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

IS - 16

ER -

Large electric-field-induced strain in centrosymmetric crystals of a dipolar ruthenium alkynyl complex

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