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Ligand Isomerism in Coordination Cages
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2018-09-19 00:00:00 , DOI: 10.1021/acs.inorgchem.8b01884
Hareesha Dasary 1 , Rajamony Jagan 1 , Dillip Kumar Chand 1
Affiliation  

Complexation reactions of palladium(II) nitrate with a set of 3-pyridyl appended nonchelating bidentate ligands possessing regioisomeric phenylene-diurea functionalities as spacers were carried out. The ligands utilized in this study are 1,1′-(1,2-phenylene)bis(3-(pyridin-3-yl)urea), L1; 1,1′-(1,3-phenylene)bis(3-(pyridin-3-yl)urea), L2; and 1,1′-(1,4-phenylene)bis(3-(pyridin-3-yl)urea), L3. The complexation reactions of the ligands (L1, L2, and L3) with palladium(II) produced single discrete isomeric cages (1, 2, and 3) of Pd2L4 formulation in each case and thereby illustrated ligand-isomerism in coordination cages. All 16 hydrogen atoms of eight urea moieties present in four ligand strands are delineated completely endohedrally in cage 1 and completely exohedrally in cage 3, whereas cage 2 exhibited half of the urea hydrogens in exohedral locations and the remaining half in endohedral locations. In addition to the variable number of solvent molecules, the cavities of cages 1 and 2 lodged four and two nitrate ions, respectively, using the endohedral (H)urea atoms (i.e., NH groups) as binding sites, whereas the cavity of 3 remained anion free. The abilities of the complexes 13 for adsorption of CO2 gas are demonstrated, and their behaviors are compared.

中文翻译:

配位笼中的配体异构

进行了硝酸钯(II)与一组带有区域异构体亚苯基-二脲功能性间隔基的附加有3-吡啶基的非螯合双齿配体的络合反应。在这项研究中使用的配体是1,1'-(1,2-亚苯基)双(3-(吡啶-3-基)脲),L1 ; 1,1'-(1,3-亚苯基)双(3-(吡啶-3-基)脲),L2 ; 和1,1'-(1,4-亚苯基)双(3-(吡啶-3-基)脲),L3。所述配体(所述的络合反应L1L2,和L3)与钯(II)产生的单异构体离散笼子(12,和3的Pd)2大号4每种情况下的配体,从而说明了配位笼中的配体异构。存在于四个配体链中的八个尿素部分的所有16个氢原子在笼子1中完全在内面勾勒出轮廓,在笼子3中完全在外面勾勒出轮廓,而笼子2在外表面位置展示出一半的尿素氢,其余在内膜位置展示出一半。除了可变数量的溶剂分子外,笼子12的腔体还利用内面(H)尿素原子(即NH基团)作为结合位点分别容纳了四个和两个硝酸根离子,而剩下的3个腔体仍然存在不含阴离子。配合物的能力展示了用于吸附CO 2气体的13,并比较了它们的行为。
更新日期:2018-09-19
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