一种具有前所未有一维支化链状次级构筑单元的杂化三维金属有机骨架。

A Heterometallic Three-Dimensional Metal-Organic Framework Bearing an Unprecedented One-Dimensional Branched-Chain Secondary Building Unit.

机构信息

College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.

College of Engineering, Information Technology & Environment, Charles Darwin University, Darwin, Northern Territory 0909, Australia.

出版信息

Molecules. 2020 May 7;25(9):2190. doi: 10.3390/molecules25092190.

DOI:10.3390/molecules25092190

PMID:32392885

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7248776/

Abstract

A heterometallic metal-organic framework (MOF) of [CdCa(BTB)(HCOO)(DEF)(HO)]∙DEF∙Sol (, HBTB = benzene-1,3,5-tribenzoic acid; DEF = ,'-diethylformamide; Sol. = undefined solvates within the pore) was prepared by solvothermal reaction of Cd(NO)·4HO, CaO and HBTB in a mixed solvent of DEF/HO/HNO. The compatibility of these two divalent cations from different blocks of the periodic table results in a solid-state structure consisting of an unusual combination of a discrete V-shaped heptanuclear cluster of [CdCa]Ca' and an infinite one-dimensional (1D) chain of [CdCaCa'] that are orthogonally linked via a corner-shared Ca ion (denoted as Ca'), giving rise to an unprecedented branched-chain secondary building unit (SBU). These SBUs propagate via tridentate BTB to yield a three-dimensional (3D) structure featuring a corner-truncated 4 helix in MOF . This outcome highlights the unique topologies possible via the combination of carefully chosen s- and d-block metal ions with polydentate ligands.

摘要

一种异金属金属-有机骨架（MOF）[CdCa（BTB）（HCOO）（DEF）（HO）]·DEF·Sol（，HBTB = 苯-1,3,5-三苯甲酸；DEF = ，'-二乙基甲酰胺；Sol. = 孔内未定义的溶剂化物）是通过 Cd(NO)·4HO、CaO 和 HBTB 在 DEF/HO/HNO 的混合溶剂中溶剂热反应制备的。来自周期表不同区块的这两种二价阳离子的兼容性导致了一种固态结构，由一个不寻常的离散 V 形七核簇[CdCa]Ca'和一个无限的一维（1D）链[CdCaCa']组成，它们通过角共享的 Ca 离子（表示为 Ca'）正交连接，形成了前所未有的支链次级建筑单元（SBU）。这些 SBU 通过三齿 BTB 传播，在 MOF 中产生具有角截断的 4 螺旋的三维（3D）结构。这一结果突出了通过精心选择的 s 和 d 块金属离子与多齿配体相结合可能实现的独特拓扑结构。