Metallo-macrocycles from a library of flexible linkers: 1D cobalt(II) coordination polymers and a supramolecular pipe
作者:Paulami Manna、Mukara Ramathulasamma、Suresh Bommakanti、Samar K. Das
DOI:10.1016/j.poly.2018.05.047
日期:2018.9
Three cobalt(II) coordination polymers containing compounds Co(3-mboba)(1,2-bix)(2)}(n) (1), Co-2(1,3-pda)(px3ampy)(H2O)(2)}(n) (2), Co-2(hfipbb)(2)(bpbix)(2)}(n) (3), that are formed from three different bent carboxylic acids [3,3'-methylenebis(oxy)dibenzoic acid (3-H(2)mboba), 2,2'-(1,3-phenylene)diacetic acid (1,3-H(2)pda) and 4,4'-(perfiuoropropane-2,2-diyl)dibenzoic acid (H(2)hfipbb)] as primary ligands and three different N,N}-donor linkers [1,2-bis((1H-imidazol-1-yl)methyl)benzene(1,2-bix), N,N'-(1,4-phenylenebis(methylene)) dipyridin-3-amine (px3ampy) and 4,4'-bis((1H-imidazol-1-yl)methyl)biphenyl (bpbix)] as secondary ligands, have been synthesized under hydrothermal conditions. Compounds 1-3 are characterized by single crystal X-ray diffraction analysis, IR spectroscopy, thermogravimetric (TG) and elemental analysis. Single crystal X-ray crystallography shows that diverse metallo-macrocycles are formed in compounds 1, 2 and 3. In the crystal structure of compound 1, two different metallo-macrocyles, 28-membered metal-acid Co-2(3-mboba)(2)} ring and 24-memberedmetal-N-linker Co-2(1,2-bix)(2)} ring, are formed. The alternative arrangement of these macrocylic rings leads to the formation of 1D chainlike coordination polymer (compound 1). In the crystal of compound 2, a 25 -membered macrocycle ring Co(1,3-pda)(px3ampy)} is formed from one dicarboxylic acid ligand and one N,N}ligand, which further undergoes coordination with itself resulting in the formation of 1D chain. The Co-3(hfipbb)(bpbix)(2)) metallamacrocycle, observed in the crystal structure of compound 3, is more diversified in the sense that it is relatively bigger in size and this trinuclear metallo-macrocycle is formed by one dicaryboxylic acid ligand and two N,N} donor linkers, but not in a plane. Interestingly, the inter-linking of these non-planar macrocycles results in the construction of a supramolecular pipe. (C) 2018 Elsevier Ltd. All rights reserved.