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The molecular structure of cis-2,6-(E,E)-bis(ferrocenylidene)-N-methyl-4-piperidone (1) has been determined by X-ray crystallography. Compound 1 crystallizes in the monoclinic chiral space group P2(1), a=6.0055(17)Å, b=12.802(4)Å, c=14.465(4)Å, β=95.438(4)°, V=1107.1(5)Å 3 , Z=2, and D calc =1.516Mg/m 3 ; R=0.0335, Rw=0.0682 for 4230 reflections with I>2σ(I). The substituents...
Crystalline polymorphism is quite common for non-linear optical (NLO) compounds. During our studies of NLO materials we found several compounds that crystallize in two or more forms. We present a short review of our recent data on the crystalline polymorphism of NLO compounds. Among the compounds studied, we found examples of concomitant polymorphism, induced conformational polymorphism, and organic...
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