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Õâ¸ö¾ä×Ó£¨The decrease of the C=C stretching vibration frequency for polyene of increased the conjugation length has been explained by assuming that, with the increase of the conjugation length, the ¦Ð-electrons delocalization tends to equalize the CC bond lengths, thereby decreasing the bond order of C=C bonds and causing a lower C=C stretching frequency for longer polyene.£©±È½Ï³¤£¬Çë¸ßÊÖ°ïæ¼ò»¯³É¼òµ¥Ã÷Á˵ÄÒ»Á½¾ä¡£
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ouyangshunli: ½ð±Ò+5, ¡ï¡ï¡ïºÜÓаïÖú, ллÄúµÄ°ïÖú£¡ 2015-08-08 22:41:59
Associating with the increase of the conjugation length, the ¦Ð-electrons delocalization tends to equalize the CC bond lengths. In this case, the bond order of C=C bonds might decrease,and hence a lower C=C stretching frequency for longer conjugation length of polyene would occur.

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2Â¥2015-08-07 00:56:51
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2Â¥: Originally posted by ken81720711 at 2015-08-07 00:56:51
Associating with the increase of the conjugation length, the ¦Ð-electrons delocalization tends to equalize the CC bond lengths. In this case, the bond order of C=C bonds might decrease,and hence a lo ...

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ouyangshunli: ½ð±Ò+15, ·­ÒëEPI+1, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2015-08-08 22:41:17
The C=C stretching vibration frequency is decreased by the increased conjugation length of polyene, because with the increase of the conjugation length, the ¦Ð-electrons delocalization tends to equalize the CC bond lengths, for instance decreasing the bond order of C=C bonds, thus resulting in a lowered lower C=C stretching frequency for longer polyene.
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