24小时热门版块排行榜    

查看: 312  |  回复: 1
本帖产生 1 个 翻译EPI ,点击这里进行查看

wangxh1984

银虫 (小有名气)


[交流] 翻译

Recent reports have described
the placement of substituents onto R-diimine ligands and
their effect on the σ-donating ability to Pd(II) and thus the Lewis
acidity of the metal.26,27 In response, we carried out an investigation
of the polymerization behavior of a series of Pd(II) R-diimine
catalysts bearing substituents in the para-aryl position on the
ligand aromatic rings.28 We discovered that this substitution was
able to perturb the metal electronics in a regular manner, as
evidenced by the remarkably linear correlation observed in the
stretching frequencies of the corresponding carbonyl complexes.
Furthermore, several trends were observed in the physical properties
of the resulting polymers. The introduction of substituents
of increasing electron-donating ability led to catalysts that
afforded polymers of higher molecular weight, slightly reduced
branching density, and a corresponding shift toward less dendritic
polymer topologies. In the case of copolymerizations with
methyl acrylate, a clear and pronounced trend of increasing
acrylate incorporation ratio and overall tolerance to polar functionality
was also observed over the range of substitution explored.

» 猜你喜欢

» 抢金币啦!回帖就可以得到:

查看全部散金贴

已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

crazybioinfo

金虫 (正式写手)


★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
wangxh1984(金币+2, 翻译EPI+1): 2011-03-16 15:49:17
ringzhu(金币+38): ~~ 2011-03-22 12:37:02
仅供参考
最近的报道描述了R-二亚胺配体上取代基的位置及其影响对二羟基聚醚(II)σ-贡献的能力,进而影响金属的刘易斯酸度。
作为回应,我们对一系列的在配体方环的芳基对位存在取代基的二羟基聚醚(II)R-二亚胺催化剂的聚合作用作了调查。
我们发现这种取代基能够有规律的扰动金属电子,因为在相应羰基复合体的伸展频率中观察到明显的线性相关性。另外,在所得聚合物的物理性质中也观察到几种趋势。能够增强电子贡献能力的取代基的引入,导致催化剂提供具有更高分子量的聚合物,显著减少分枝密度,以及相应的转变为较低树状聚合物的拓扑性质。在与丙烯酸甲酯的共聚合作用中,清晰显著的增强趋势在丙烯酸盐合并率以及在研究的替换范围内对极性功能的整体容度中都有所呈现。
2楼2011-03-14 19:14:43
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
相关版块跳转 我要订阅楼主 wangxh1984 的主题更新
普通表情 高级回复 (可上传附件)
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[考研] 欢迎采矿、地质、岩土、计算机、人工智能等专业的同学报考 +3 pin8023 2026-02-28 5/250 2026-03-02 00:24 by 花YOU重开日
[考研] 279求调剂 +3 dua1 2026-03-01 4/200 2026-03-02 00:23 by 大脸蛋子
[考研] 求调剂 +5 yunziaaaaa 2026-03-01 6/300 2026-03-01 23:57 by ccp273206157
[考研] 一志愿郑大材料学硕298分,求调剂 +5 wsl111 2026-03-01 5/250 2026-03-01 23:45 by 暮雨星晴
[考研] 275求调剂 +3 明远求学 2026-03-01 3/150 2026-03-01 22:29 by 刘兵
[硕博家园] 博士自荐 +7 科研狗111 2026-02-26 11/550 2026-03-01 22:24 by 哲平L
[考研] 274求调剂 +3 cgyzqwn 2026-03-01 6/300 2026-03-01 21:24 by cgyzqwn
[考研] 高分子化学与物理调剂 +6 好好好1233 2026-02-28 12/600 2026-03-01 19:48 by 好好好1233
[考研] 306分材料调剂 +4 chuanzhu川烛 2026-03-01 5/250 2026-03-01 19:48 by 无际的草原
[考研] 0856化工专硕求调剂 +12 董boxing 2026-03-01 12/600 2026-03-01 19:45 by 材子momo
[考研] 0856材料求调剂 +11 hyf hyf hyf 2026-02-28 12/600 2026-03-01 18:57 by 18137688336
[考研] 291分工科求调剂 +9 science饿饿 2026-03-01 10/500 2026-03-01 18:55 by 18137688336
[考研] 0856材料求调剂 +4 麻辣鱿鱼 2026-02-28 4/200 2026-03-01 16:51 by caszguilin
[考研] 307求调剂 +5 wyyyqx 2026-03-01 5/250 2026-03-01 15:21 by Fff-1
[考研] 材料工程274求调剂 +3 Lilithan 2026-03-01 3/150 2026-03-01 14:58 by ms629
[考研] 298求调剂 +9 人间唯你是清欢 2026-02-28 12/600 2026-03-01 14:23 by Ducount.Y
[考研] 材料调剂 +4 爱擦汗的可乐冰 2026-02-28 4/200 2026-03-01 00:38 by 猫猫球alter
[考研] 085600材料工程一志愿中科大总分312求调剂 +8 吃宵夜1 2026-02-28 10/500 2026-02-28 20:27 by L135790
[考研] 276求调剂 +3 路lyh123 2026-02-28 4/200 2026-02-28 19:45 by 路lyh123
[硕博家园] 【博士招生】太原理工大学2026化工博士 +4 N1ce_try 2026-02-24 8/400 2026-02-26 08:40 by N1ce_try
信息提示
请填处理意见