Abstract
Four adducts of triphenylphosphine oxide with aromatic carboxylic acids have been synthesized and tested for second-order non-linear optical properties. These were with N-methylpyrrole-2-carboxylic acid (1), indole-2-carboxylic acid (2), 3-dimethylaminobenzoic acid (3), and thiophen-2-carboxylic acid (4). Compound (1) produced clear, colourless crystals (space group P 212121 with a 9·892(1), b 14·033(1), c 15·305(1) Å, Z 4) which allowed the structure to be determined by X-ray diffraction.
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