The Microwave Spectra and <I>r</I><SUB>0</SUB>, <I>r</I><SUB>s</SUB>, and <I>r</I><SUB>m</SUB> Structures of Ethylene Oxide
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The rotational spectra of ten isotopic species of ethylene oxide, <SUP>12</SUP>C<SUB>2</SUB>H<SUB>4</SUB><SUP>16</SUP>O, <SUP>12</SUP>C<SUP>13</SUP>CH<SUB>4</SUB><SUP>16</SUP>O, <SUP>12</SUP>C<SUB>2</SUB>H<SUB>4</SUB><SUP>18</SUP>O, <SUP>12</SUP>C<SUB>2</SUB>H<SUB>3</SUB>D<SUP>16</SUP>O, <I>cis</I>- and <I>trans</I>-<SUP>12</SUP>C<SUB>2</SUB>H<SUB>2</SUB>D<SUB>2</SUB><SUP>16</SUP>O, <SUP>12</SUP>C<SUP>13</SUP>CH<SUB>2</SUB>D<SUB>2</SUB><SUP>16</SUP>O, and <SUP>12</SUP>C<SUB>2</SUB>H<SUB>2</SUB>D<SUB>2</SUB><SUP>18</SUP>O were observed. A least-squares fit including centrifugal distortion effect to the first order was made to derive the effective values of the A′, B′, C′, τ′<I><SUB>aaaa</SUB></I>, τ′<I><SUB>bbbb</SUB></I>, τ′<I><SUB>cccc</SUB></I>, and τ′<I><SUB>aabb</SUB></I> parameters and their correlation factors; τ′<I><SUB>bbcc</SUB></I> and τ′<I><SUB>aacc</SUB></I> were found to be insignificant. The rotational constants were used to determine the <I>r</I><SUB>0</SUB>, <I>r</I><SUB>s</SUB>, and <I>r</I><SUB>m</SUB> structures. The structural parameters were derived as:<BR>& r_0(CC)=1.470±0.003, r_s(CC)=1.466±0.002, r_m(CC)=1.462±0.003,<BR>& r_0(CH)=1.085±0.004, r_s(CH)=1.085±0.001, r_m(CH)= 1.086±0.004,<BR>& r_0(CO)=1.434±0.002, r_s(CO)=1.431±0.001, r_m(CO)=1.428±0.002,<BR>& ∠_0HCH=116.28±0.69, ∠_SHGH=116.61±0.09, ∠_mHGH=116.92±0.69, <BR>θ<SUB>0</SUB>=22.34±0.46, θ<SUB>s</SUB>=21.99±0.11, θ<SUB>m</SUB>=21.63±0.48 in units of Å and degrees; θ represents the angle of the H<SUB>2</SUB>C plane to the CC bond. The indicated error limits are 2.5 times the variances.
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