Structure Determination of Crosspolymerized Poly(1,11-Dodecadiyne)
Electron diffraction patterns were obtained from cross-polymerized crystals of poly(1,11-dodecadiyne), formed by casting thin (>200Å) films of uncrosspolymerized polymer from chloroform. Two orientations of these crystals were obtained by varying the evaporation rate of the chloroform solvent. Crosspolymerization resulted from subsequent exposure of these samples to Co60 γ-radiation. Thirty-six independent reflections were obtained from the a*c* reciprocal lattice net and a lattice net have b* and the (h 0 ħ) reciprocal lattice direction as orthogonal axes. Refinement of the structure was accomplished with these data. The unit cell of the crosspolymerized material was monoclinic, space group P21/n, a = 9.17Å, b (hydrocarbon chain axis and unique axis) = 12.25Å, c (polydiacetylene axis) = 9.92Å and the angle β = 123.5°.
KeywordsElectron Diffraction Pattern Triple Bond Carbon Coated Copper Grid Unique Axis Structure Factor Calculation
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