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Unprecedented (4,6)-Connected Net with Mixed-Valence M2IIMIII Trinuclear and M6II Hexanuclear Clusters (M = Ni, Co): Syntheses, Crystal Structures, and Magnetic Properties
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2017-09-20 00:00:00 , DOI: 10.1021/acs.cgd.7b00795
Lu Zhai 1, 2 , Zhu-Xi Yang 1 , Wen-Wei Zhang 2 , Jing-Lin Zuo 2 , Xiao-Ming Ren 1, 2, 3
Affiliation  

Two new cluster-based metal–organic frameworks (MOFs), {(M3OH)2[(M6O(OH)2(H2O)2]1.5(EBTC)6}·solvent (M = Ni and Co for 1 and 2, respectively), have been synthesized using a solvothermal reaction, where H4EBTC represents 1,1′-ethynebenzene-3,3′,5,′-tetracarboxylic acid. The isostructural 1 and 2 crystallize in the hexagonal space group P6/mmm, containing class III mixed-valence Ni2IINiIII/Co2IICoIII trinuclear and Ni6II/Co6II hexanuclear secondary building units (SBUs). Both SBUs possess the perfectly planar μ3-O2– and μ4-O2– bridging mode, respectively. In 1 and 2, two trinuclear and three hexanuclear clusters form a cage with the dimensions of ca. 5.0 × 5.0 × 7.8 Å3, which align into a bamboo-like structure through sharing the trinuclear clusters along the c-axis, and form a honeycomb-like structure via sharing the hexanuclear clusters on the plane parallel to the crystallographic (001) plane. In addition, the magnetic properties have been further investigated for two MOFs, disclosing that the weakly antiferromagnetic couplings dominate between the metal ions and no valence ordering occurs even at 2 K.

中文翻译:

具有混合价M 2 II M III三核和M 6 II六核簇(M = Ni,Co)的史无前例的(4,6)-连通网:合成,晶体结构和磁性

两种新的基于簇的金属有机框架(MOF),{(M 3 OH)2 [(M 6 O(OH)2(H 2 O)2 ] 1.5(EBTC)6 }·溶剂(M = Ni和Co分别用溶剂热反应合成了12),其中H 4 EBTC代表1,1'-乙炔苯3,3',5,'-四羧酸。同构12在六边形空间中结晶P 6 / mmm组,包含III类混合价Ni 2 II Ni III/ Co 2 II Co III三核和Ni 6 II / Co 6 II六核二级建筑单元(SBU)。两者的SBU具备完美的平面μ 3 -O 2-和μ 4 -O 2-分别桥接模式。在12中,两个三核簇和三个六核簇形成一个笼子,尺寸约为ca。5.0×5.0×7.8埃3,其对准到通过沿共享三核簇竹子状结构Ç轴,并通过在平行于晶体(001)平面的平面上共享六核簇而形成蜂窝状结构。此外,对两个MOF的磁性进行了进一步研究,揭示出弱反铁磁耦合在金属离子之间起主导作用,即使在2 K时也不会出现价序。
更新日期:2017-09-20
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