已入深夜,您辛苦了!由于当前在线用户较少,发布求助请尽量完整地填写文献信息,科研通机器人24小时在线,伴您度过漫漫科研夜!祝你早点完成任务,早点休息,好梦!

Monitoring structural transformations in crystals. 6. The [4 + 4] photodimerization of 9-methylanthracene

二聚体 单体 分子 环戊酮 化学 结晶学 Crystal(编程语言) 晶体结构 光化学 催化作用 有机化学 聚合物 计算机科学 程序设计语言
作者
Ilona Turowska‐Tyrk,Elżbieta Trzop
出处
期刊:Acta crystallographica [Wiley]
卷期号:59 (6): 779-786 被引量:45
标识
DOI:10.1107/s0108768103023255
摘要

The structural changes in a crystal of 9-methylanthracene (1) during the [4 + 4] photodimerization were monitored by means of X-ray diffraction. This is the first example in the literature of such a study of a [4 + 4] photodimerization. The results obtained were compared with data for the [2 + 2] photodimerization. The shape of the product molecules and their preferred packing can explain the crystal disintegration. This was the reason that the reaction was monitored only to 28% completion. As far as could be determined the reaction proceeds with a constant rate. The cell volume increases at the beginning of the transformation and decreases afterwards. The product molecules do not assume a fixed position in the crystal during the photo-reaction, but move in a smooth way that includes a rotational component. The movements of the reactant are much smaller. Movements of molecules characterized by a rotational component were also observed in the case of the [2 + 2] photodimerization of 5-benzylidene-2-benzylcyclopentanone and 5-benzylidene-2-(4-chlorobenzyl)-cyclopentanone. The distance between the reacting atoms of the adjacent monomer molecules of (1) decreases with the degree of reaction completion, but more slowly than in the case of the [2 + 2] photodimerizations cited above. The orientation of the neighbouring monomer molecules changes during the phototransformation so that the monomer pair resembles the dimer product.

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
6秒前
科研小学生完成签到,获得积分10
6秒前
7秒前
8秒前
汉堡包应助科研通管家采纳,获得10
8秒前
8秒前
yy完成签到,获得积分10
9秒前
9秒前
栗子鱼发布了新的文献求助10
10秒前
乐乐应助黄玥采纳,获得10
11秒前
米米发布了新的文献求助10
12秒前
栗子鱼完成签到,获得积分10
14秒前
机灵的笑南完成签到,获得积分20
16秒前
16秒前
19秒前
耶格尔完成签到 ,获得积分10
19秒前
19秒前
张辰熙完成签到 ,获得积分10
22秒前
量子星尘发布了新的文献求助10
24秒前
文艺凉面完成签到 ,获得积分10
25秒前
Nefelibata完成签到,获得积分10
25秒前
lqqq完成签到 ,获得积分10
28秒前
彼岸花开发布了新的文献求助50
29秒前
Bingtao_Lian完成签到 ,获得积分10
30秒前
31秒前
33秒前
33秒前
Huay完成签到 ,获得积分10
35秒前
陆碌路发布了新的文献求助10
38秒前
38秒前
43秒前
Limerencia完成签到,获得积分10
44秒前
在水一方应助扳手已就位采纳,获得10
46秒前
111完成签到 ,获得积分10
46秒前
47秒前
光能使者完成签到,获得积分10
49秒前
星河之外spectator完成签到 ,获得积分10
50秒前
雨雨雨雨雨文完成签到 ,获得积分10
51秒前
sunshine完成签到 ,获得积分10
53秒前
多亿点完成签到 ,获得积分10
53秒前
高分求助中
The Mother of All Tableaux Order, Equivalence, and Geometry in the Large-scale Structure of Optimality Theory 2400
Ophthalmic Equipment Market by Devices(surgical: vitreorentinal,IOLs,OVDs,contact lens,RGP lens,backflush,diagnostic&monitoring:OCT,actorefractor,keratometer,tonometer,ophthalmoscpe,OVD), End User,Buying Criteria-Global Forecast to2029 2000
A new approach to the extrapolation of accelerated life test data 1000
Cognitive Neuroscience: The Biology of the Mind (Sixth Edition) 1000
Optimal Transport: A Comprehensive Introduction to Modeling, Analysis, Simulation, Applications 800
Official Methods of Analysis of AOAC INTERNATIONAL 600
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 588
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3959940
求助须知:如何正确求助?哪些是违规求助? 3506202
关于积分的说明 11128256
捐赠科研通 3238184
什么是DOI,文献DOI怎么找? 1789535
邀请新用户注册赠送积分活动 871810
科研通“疑难数据库(出版商)”最低求助积分说明 803024