Synthesis and structural characterization of lanthanide(iii) nitrate complexes of a tetraiminodiphenol macrocycle in the solid state and in solution

镧系元素 等结构 齿合度 化学 正方形反棱镜 结晶学 质子化 金属 顺磁性 金属转移 质子核磁共振 晶体结构 无机化学 立体化学 离子 有机化学 催化作用 物理 量子力学
作者
Pradip Bag,Ülrich Flörke,K. Nag
出处
期刊:Dalton Transactions [Royal Society of Chemistry]
卷期号: (26): 3236-3248 被引量:38
标识
DOI:10.1039/b516306d
摘要

The lanthanide(III) complexes [Ln(LH2)(NO3)3] 1-11(La-Er), 15(Y) and [Ln(LH2)(NO3)2(H2O)](NO3) 12-14 (Tm-Lu) of the tetraiminodiphenolate macrocycle L2- have been prepared by the transmetallation reaction between [Pb(LH2)(NO3)2] and Ln(NO3)3.nH2O. In these compounds, the uncoordinated imino nitrogens are protonated and are hydrogen bonded to the phenolate oxygens. The X-ray crystal structures of the La (1), Ho (10) and Lu (14) compounds have been determined. Compounds 1 and 10, in which all the three nitrates are bound in bidentate fashion, are isostructural with distorted bicapped square antiprism geometry for the metal centre. In [Lu(LH2)(NO3)2(H2O)](NO3) 14, of the two metal bound nitrates one is bidentate and the other is unidentate, while the metal centre obtains a distorted square antiprism coordination environment. Proton NMR spectra of the paramagnetic lanthanide complexes have been studied in detail. Contributions of contact and pseudo-contact shifts to the lanthanide induced isotropic shifts (LIS) of the macrocycle protons have been separated and good agreement has been obtained between the calculated LIS values and the experimentally observed values. Analysis of the NMR data has led us to conclude that all the complexes in dimethyl sulfoxide solution attain similar configurations. The absorption and emission spectral characteristic of several compounds have been investigated. The complexes of samarium (5) and europium (6) on photoexcitation at 400 nm exhibit well-resolved luminescence spectra at 77 K both in the solid state and a methanol-ethanol (1 : 4) glassy matrix. For the terbium (8) and dysprosium (9) complexes, however, the observed luminescence peaks are less resolved and weak in intensity.
最长约 10秒,即可获得该文献文件

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
大个应助mayberichard采纳,获得10
1秒前
memedaaaah发布了新的文献求助10
1秒前
1秒前
ED应助Lee采纳,获得10
1秒前
A2QD完成签到,获得积分10
1秒前
希望天下0贩的0应助Lee采纳,获得10
1秒前
1秒前
kagami发布了新的文献求助10
2秒前
NexusExplorer应助研友_ZlPDdZ采纳,获得10
2秒前
3秒前
所所应助dream采纳,获得10
3秒前
318yyl完成签到,获得积分10
3秒前
情怀应助rong采纳,获得10
3秒前
白立轩发布了新的文献求助10
4秒前
4秒前
5秒前
余日秋山发布了新的文献求助10
5秒前
打打应助zz采纳,获得10
5秒前
Rank发布了新的文献求助30
5秒前
还好完成签到,获得积分10
5秒前
6秒前
6秒前
6秒前
JasonLee发布了新的文献求助10
6秒前
8秒前
ZZ发布了新的文献求助10
8秒前
wjx发布了新的文献求助10
8秒前
嗯嗯发布了新的文献求助10
8秒前
qxy完成签到 ,获得积分10
9秒前
10秒前
10秒前
cen完成签到,获得积分10
10秒前
申小萌发布了新的文献求助30
10秒前
小智发布了新的文献求助10
10秒前
null发布了新的文献求助10
11秒前
mayberichard发布了新的文献求助10
11秒前
12秒前
赘婿应助memedaaaah采纳,获得10
12秒前
领导范儿应助落后的采波采纳,获得10
13秒前
13秒前
高分求助中
Picture Books with Same-sex Parented Families: Unintentional Censorship 700
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
Effective Learning and Mental Wellbeing 300
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 3975165
求助须知:如何正确求助?哪些是违规求助? 3519595
关于积分的说明 11198781
捐赠科研通 3255912
什么是DOI,文献DOI怎么找? 1798001
邀请新用户注册赠送积分活动 877343
科研通“疑难数据库(出版商)”最低求助积分说明 806298