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Issue 9, 2007
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Polymorphism, crystal growth and characterization of an organic nonlinear optical material: DAPSH

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Abstract

We have investigated the crystal growth, structural and physical properties of the organic nonlinear optical salt trans-4′-(dimethylamino)-N-phenyl-4-stilbazolium hexafluorophosphate (DAPSH). The chromophore in this recently created material shows a first molecular hyperpolarizability considerably larger than that of the related cation in the well-studied salt DAST (trans-4′-(dimethylamino)-N-methyl-4-stilbazolium tosylate). Through recrystallization of DAPSH using various solvents and conditions we have obtained three different crystalline phases. Phase a of DAPSH has a large second-order nonlinear optical susceptibility χ2. It crystallizes from acetone solutions and grows as purple needles, which are non-centrosymmetric with the space group Cc being suitable for electro-optic applications. Phase b with the triclinic non-polar space group P[1 with combining macron] appears as reddish-brown thin plates when grown from DMSO solutions. It shows large third-order nonlinear optical susceptibility χ3 and can be easily grown as thin films, making it a good candidate for all-optical switching applications. Phase c with the non-polar space group P21/m grows as bright orange plates when crystallized from (50 : 50 vol%) ethanol–acetone solutions. This material shows no significant bulk nonlinear optical activity.

Graphical abstract: Polymorphism, crystal growth and characterization of an organic nonlinear optical material: DAPSH

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Publication details

The article was received on 29 Mar 2007, accepted on 23 May 2007 and first published on 11 Jun 2007


Article type: Paper
DOI: 10.1039/B704737A
CrystEngComm, 2007,9, 772-776

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    Polymorphism, crystal growth and characterization of an organic nonlinear optical material: DAPSH

    B. Ruiz, B. J. Coe, R. Gianotti, V. Gramlich, M. Jazbinsek and P. Günter, CrystEngComm, 2007, 9, 772
    DOI: 10.1039/B704737A

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