| ²é¿´: 722 | »Ø¸´: 3 | ||
| ±¾Ìû²úÉú 1 ¸ö ·ÒëEPI £¬µã»÷ÕâÀï½øÐв鿴 | ||
ouyangshunliľ³æ (ÕýʽдÊÖ)
|
[ÇóÖú]
¼ò»¯Ò»¸ö³¤¾ä×Ó
|
|
| 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¡£ |
» ²ÂÄãϲ»¶
Сľ³æÃ»ÂäÁË£¬³ýÁËÆíµ»Ìû×Ó£¬¼¸ºõ¿´²»µ½ÓмÛÖµµÄÌû×Ó
ÒѾÓÐ15È˻ظ´
ÃæÉϵÄË®ºÜÉî
ÒѾÓÐ18È˻ظ´
¹úÉç¿ÆÍ¨Ñ¶ÆÀÉó
ÒѾÓÐ5È˻ظ´
5¸ö%2F£¬·Ç¹Ì¶¨¶Î22¸ö×Öĸ
ÒѾÓÐ9È˻ظ´
ÉúÃü¿ÚC13ÃæÉÏ»áÆÀʱ¼ä
ÒѾÓÐ11È˻ظ´
ÄÚÐÄØÑ·¦
ÒѾÓÐ16È˻ظ´
ÉúÃü¿ÚÃæÉÏ»áÆÀ½áÊøÁËÂð´ó¼ÒÓÐÖªµÀ½á¹ûÂð£¿ÏÖÔÚ»¹Ã»Óнá¹ûÕý³£²»£¿
ÒѾÓÐ9È˻ظ´
ͶӢÎÄÆÚ¿¯ÈçºÎ²éÖØ
ÒѾÓÐ6È˻ظ´
²»ÒªÔÙÊý¹ú×ÔÈ»ÉêÇëÊéµÄ filecode µÄ·Ö¸ô·û¸öÊýÁË
ÒѾÓÐ21È˻ظ´
²®°·Éϼ׻ùÇóÖú
ÒѾÓÐ7È˻ظ´
ken81720711
ľ³æ (ÕýʽдÊÖ)
- ·ÒëEPI: 1
- Ó¦Öú: 6 (Ó×¶ùÔ°)
- ½ð±Ò: 3431.2
- É¢½ð: 79
- ºì»¨: 5
- Ìû×Ó: 651
- ÔÚÏß: 89.1Сʱ
- ³æºÅ: 3947758
- ×¢²á: 2015-06-30
- ÐÔ±ð: GG
- רҵ: ÉúÎïÎÞ»ú»¯Ñ§
¡¾´ð°¸¡¿Ó¦Öú»ØÌû
¡ï ¡ï ¡ï ¡ï ¡ï
ouyangshunli: ½ð±Ò+5, ¡ï¡ï¡ïºÜÓаïÖú, ллÄúµÄ°ïÖú£¡ 2015-08-08 22:41:59
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. [ ·¢×ÔСľ³æ¿Í»§¶Ë ] |

2Â¥2015-08-07 00:56:51
ken81720711
ľ³æ (ÕýʽдÊÖ)
- ·ÒëEPI: 1
- Ó¦Öú: 6 (Ó×¶ùÔ°)
- ½ð±Ò: 3431.2
- É¢½ð: 79
- ºì»¨: 5
- Ìû×Ó: 651
- ÔÚÏß: 89.1Сʱ
- ³æºÅ: 3947758
- ×¢²á: 2015-06-30
- ÐÔ±ð: GG
- רҵ: ÉúÎïÎÞ»ú»¯Ñ§
¡¾´ð°¸¡¿Ó¦Öú»ØÌû
|
×îºóµÄoccur¸ÄΪtake place»á¸üºÃ£¬µÚÒ»¸öindepebndent clause,Â¥Ö÷×Ô¼ºÈ¡ÉᣬÄÜÁ¦ÓÐÏÞ¡£ [ ·¢×ÔСľ³æ¿Í»§¶Ë ] |

3Â¥2015-08-07 01:04:14
Î人һÐÄÒ»Òë
¾èÖú¹ó±ö (ÖøÃûдÊÖ)
- ·ÒëEPI: 502
- Ó¦Öú: 8 (Ó×¶ùÔ°)
- ½ð±Ò: 2283.1
- É¢½ð: 5914
- ºì»¨: 32
- Ìû×Ó: 1665
- ÔÚÏß: 321.9Сʱ
- ³æºÅ: 3587652
- ×¢²á: 2014-12-10
- ÐÔ±ð: GG
- רҵ: ¸ß·Ö×Ӻϳɻ¯Ñ§
¡¾´ð°¸¡¿Ó¦Öú»ØÌû
É̼ÒÒѾÖ÷¶¯ÉùÃ÷´Ë»ØÌû¿ÉÄܺ¬ÓÐÐû´«ÄÚÈÝ
¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï
ouyangshunli: ½ð±Ò+15, ·ÒëEPI+1, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2015-08-08 22:41:17
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. |
4Â¥2015-08-07 10:16:23











»Ø¸´´ËÂ¥
10