Design of a Solid Inclusion Compound with Optimal Properties as a Linear Dichroic Filter for X‐ray Polarization Analysis

Chao, Mao‐Hsun; Kariuki, Benson M.; Harris, Kenneth David Maclean; Collins, Steven; Laundy, D.

doi:10.1002/anie.200350891

Cited by 30 publications

(19 citation statements)

References 12 publications

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“…[16][17][18][19][20][21] However, rationalization of the factors that control the structural properties of such materials is often far from straightforward, as the observed crystal structure generally arises from the subtle inter-play of several different types of intermolecular interactions of comparable strengths. Nevertheless, for cases in which one specific intermolecular interaction (or a small number of interactions) has a dominant role in directing the structure, it can become possible to develop a reliable rationalization of the observed arrangement of molecules in the crystal, and hence to exploit such understanding as the basis for reliable a priori prediction of the structural properties of other (related) materials.…”

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confidence: 99%

Design of a Molecular Quasicrystal

Zhou

Harris

2006

ChemPhysChem

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A revolutionary discovery in solid state science was made in 1984 when Schechtman and co-workers [1] showed that certain metal alloy materials (typified by Al x Mn y ) can exhibit diffraction patterns with 10-fold symmetry. The apparent dilemma was that the diffraction patterns of these materials comprise sharp Bragg-like reflections characteristic of ordered crystalline materials, whereas the accepted dogma maintained that 10-fold or 5-fold symmetry is impossible in a crystalline material with long-range periodic order.[2] Resolution of this issue [3][4][5] rests on the fact that certain quasiperiodic tilings (e.g. the Penrose tiling [6] ) have diffraction patterns that contain sharp Bragg-like reflections based on a 10-fold symmetric reciprocal space, [7] resembling those observed for the metal alloy materials. Such tilings [6,8,9] are constructed from a set of geometrically welldefined tiles, assembled according to well-defined rules, but do not have translational periodicity. Following the pioneering work in this field, several other materials have been discovered that exhibit diffraction patterns with 10-fold symmetry, and their properties have been investigated experimentally and theoretically; [10][11][12][13][14] the term "quasicrystal" is now widely adopted for such materials. Despite the huge interest in quasicrystals during the intervening period, [14,15] all examples reported to date have been metal alloy materials, and there has been no example of a quasicrystal composed of discrete molecular entities. In this paper, we demonstrate for the first time that it is feasible to construct a quasicrystal using organic molecules as the building units, based on exploiting similar principles to those used for the structural design of crystalline molecular materials. Our designed molecular quasicrystal, which is based on a standard Penrose tiling, is shown to be energetically stable and to give rise to a 10-fold symmetric diffraction pattern.Within the field of crystalline organic molecular materials, there is currently much interest in understanding the fundamental factors that control the observed structural properties, as such knowledge is an essential pre-requisite for the design of molecular crystals for specific applications, an area of activity often called "crystal engineering". [16][17][18][19][20][21] However, rationalization of the factors that control the structural properties of such materials is often far from straightforward, as the observed crystal structure generally arises from the subtle inter-play of several different types of intermolecular interactions of comparable strengths. Nevertheless, for cases in which one specific intermolecular interaction (or a small number of interactions) has a dominant role in directing the structure, it can become possible to develop a reliable rationalization of the observed arrangement of molecules in the crystal, and hence to exploit such understanding as the basis for reliable a priori prediction of the structural properties of other (related) materials. ...

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confidence: 99%

Design of a Molecular Quasicrystal

Zhou

Harris

2006

ChemPhysChem

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“…This results in a change in the transmission of the material as a function of azimuthal angle, for polarised incident beams with energies around the absorption edge ( Figure 1). Elsewhere, SC, KDMH and others have demonstrated the design and manufacture of a number of materials with anisotropic structures, which exhibit X-ray near-edge absorption properties that are dependent on the direction of the electric field vector with respect to the crystallographic reference frame of the material [15][16][17][18]. Springer As a case study to illustrate the type of materials design strategy that may be exploited in the design and development of X-ray dichroic filter materials, it is pertinent to highlight some of our previous work on the use of solid inclusion compounds in this field.…”

Section: Materials Researchmentioning

confidence: 99%

“…The absence of polarisation-resolved measurements for absorption edges other than those described in [14][15][16]31] makes a detailed sensitivity comparison with other technologies difficult; indeed, extending the range of measurements is one of the goals of the current programme. However, some predictions for the polarisation sensitivity of dichroic filters can be made.…”

Section: Polarisation Sensitivity Estimatesmentioning

confidence: 99%

“…This research includes the measurement (to be performed at the Daresbury Synchrotron Radiation Source) of polarisation response at a number of energies using the bromine-based compounds already described in the literature [15][16][17][18]. We will investigate strategies for modification of the crystal growth process, in order to optimise the morphology of the materials such that dichroic filter materials are prepared as large plate-like crystals of appropriate thickness, appropriate plate area and with the relevant crystallographic axis parallel to the plane of the plate.…”

Section: Research Programmementioning

confidence: 99%

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Dichroic Filters For Astronomical X-Ray Polarimetry

et al. 2006

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We describe a programme of research to investigate materials which exhibit linear dichroism at X-ray wavelengths, and to assess their potential as astronomical X-ray polarimeters. The availability of polarising filters for X-rays would offer an efficient method of quantifying the polarisation of X-ray radiation from distant, cosmic sources. A polarising dichroic filter is expected to be a compact, low mass device which could add polarimetry capability to an instrument by being introduced into the optical path ahead of a detector. We provide estimates of sensitivity in the context of the proposed XEUS observatory, which compare favourably with those for the most promising alternative technology. We also discuss a number of astrophysical sources which are suited to polarimetric study at discrete energies offered by the X-ray dichroic filter design.

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“…Based on previous results, we next intended to see if similar CT complexes would be formed from AZADO ( 2 ) with an appropriate acceptor. Moreover, we tried to prepare a supramolecule from 2 with thiourea ( 4 ), as structurally similar 1-bromoadamantane was reported to form an intriguing inclusion compound with thiouea [9]. There are some reported examples of inclusion compounds derived from TEMPO and related nitroxide radicals with host molecules such as tris( o -phenylenedioxy)cyclotriphosphazene (TPP) [10], cyclodextrin (CD) [11], or cucurbituril (CB) derivatives [12] but the inclusion compound derived from AZADO is still unknown.…”

Section: Introductionmentioning

confidence: 99%