Two- and three-dimensional nickel(ii) and copper(ii) metal–organic frameworks based on 1H-pyrazole-4-carboxylate

IF 2.4 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

CrystEngComm Pub Date : 2026-05-20 DOI:10.1039/D6CE00199H

Shin-ichiro Takeshi, Liangcheng Lyu, Akane Hase, Nagito Haga, Rina Takano, Takayuki Ishida and Tamizo Kogane

{"title":"Two- and three-dimensional nickel(ii) and copper(ii) metal–organic frameworks based on 1H-pyrazole-4-carboxylate","authors":"Shin-ichiro Takeshi, Liangcheng Lyu, Akane Hase, Nagito Haga, Rina Takano, Takayuki Ishida and Tamizo Kogane","doi":"10.1039/D6CE00199H","DOIUrl":null,"url":null,"abstract":"The stoichiometric reactions of 1H-pyrazole-4-carboxylic acid (Hpzca) with nickel(II) or copper(II) acetate hydrates and pyrazole (Hpz) under ambient conditions (aqueous methanol or water) or solvothermal conditions (2-propanol) afforded two-dimensional coordination polymers, [M(pzca)2(Hpz)2]n (M = Ni (1), Cu (2)). The carboxylic acid group of Hpzca is deprotonated, and the resulting pzca− ligand acts as a μ2-κ1O:κ1N bridge. In the absence of the Hpz capping ligand, a three-dimensional coordination polymer, [Cu(pzca)2]n (3), was obtained. One pzca− ligand functions as a μ2-κ2O,O′:κ1N bridge, while the other acts as a μ3-κ1O:κ1O′:κ1N bridge. Thermogravimetric analysis revealed that compounds 1 and 3 contain no solvent molecules. Magnetic measurements indicate weak antiferromagnetic interactions between the metal centers. In addition, mononuclear cis- and trans-isomers of [Ni(pzca-N)2(H2O)4] were isolated and characterized, both of which appear to be plausible intermediates toward the formation of MOF 1.","PeriodicalId":70,"journal":{"name":"CrystEngComm","volume":" 24","pages":" 3743-3751"},"PeriodicalIF":2.4000,"publicationDate":"2026-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"CrystEngComm","FirstCategoryId":"92","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2026/ce/d6ce00199h","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

The stoichiometric reactions of 1H-pyrazole-4-carboxylic acid (Hpzca) with nickel(II) or copper(II) acetate hydrates and pyrazole (Hpz) under ambient conditions (aqueous methanol or water) or solvothermal conditions (2-propanol) afforded two-dimensional coordination polymers, [M(pzca)₂(Hpz)₂]_n (M = Ni (1), Cu (2)). The carboxylic acid group of Hpzca is deprotonated, and the resulting pzca⁻ ligand acts as a μ₂-κ¹O:κ¹N bridge. In the absence of the Hpz capping ligand, a three-dimensional coordination polymer, [Cu(pzca)₂]_n (3), was obtained. One pzca⁻ ligand functions as a μ₂-κ²O,O′:κ¹N bridge, while the other acts as a μ₃-κ¹O:κ¹O′:κ¹N bridge. Thermogravimetric analysis revealed that compounds 1 and 3 contain no solvent molecules. Magnetic measurements indicate weak antiferromagnetic interactions between the metal centers. In addition, mononuclear cis- and trans-isomers of [Ni(pzca-N)₂(H₂O)₄] were isolated and characterized, both of which appear to be plausible intermediates toward the formation of MOF 1.

Abstract Image

查看原文本刊更多论文

基于h -吡唑-4-羧酸盐的二维和三维镍（ii）和铜（ii）金属有机骨架

1h -吡唑-4-羧酸（Hpzca）与醋酸镍（II）或醋酸铜（II）水合物和吡唑（Hpz）在常温条件下（甲醇水溶液或水）或溶剂热条件下（2-丙醇）进行化学计量反应，得到二维配位聚合物[M(pzca)2(Hpz)2]n (M = Ni （1), Cu(2)）。Hpzca的羧基被去质子化，得到的pzca -配体作为μ2-κ 10o:κ1N桥。在没有Hpz旋盖配体的情况下，得到了三维配位聚合物[Cu(pzca)2]n(3)。一种pzca -配体作为μ2-κ2O，O ':κ1N桥，另一种作为μ3 -κ2O:κ 10 ':κ1N桥。热重分析表明化合物1和3不含溶剂分子。磁测量表明金属中心之间存在弱的反铁磁相互作用。此外，分离和表征了[Ni(pzca-N)2(H2O)4]的单核顺式和反式异构体，这两种异构体似乎都是形成MOF 1的可能中间体。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊