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From One-Dimensional, Two-Dimensional to Three-Dimensional Entangled Architectures with Polythreading Feature: Synthesis, Structures, and Properties

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journal contribution
posted on 09.02.2017, 15:22 by Xian-Ying Duan, Mei-Lin Wei
Under hydrothermal conditions, eight coordination polymers, namely, [Zn­(H2L)­(bpn)]n (1) and [Co­(H2L)­(bpn)]n (2), [Co­(H2L)­(bpe)]2­·bpe­·H2O}n (3), {[Mn2(H2L)­(bpa)­(H2O)3]­·bpa­·4H2O}n (4), {[Zn­(H2L)­(bpe)]­·H2O}n (5), {[Zn­(H2L)­(bpa)]­·H2O}n (6), {[Cd­(L)0.5­(bime)­(H2O)]2­·2H2O}n (7), and {[Ni2(L)­(bime)­(H2O)2]­·H2O}n (8) [H4L= methylenediisophthalic acid; bpn = 4,4′-azopyridine; bpe = 1, 2-bis­(4-pyridyl)­ethylene; bpa = 1, 2-bis­(4-pyridyl)­ethane; bime = 1,2-ethanediylbis­(imidazole)] have been prepared based on mixed ligands. The result of X-ray crystallographic analyses indicates all the complexes have a polythreading feature. In complexes 12, one-dimensional (1D) [M2(H2L)] polygrids are threaded by R66 hydrogen bonds formed by protonated carboxylates of H2L2– from adjacent chains. Complexes 34 have 1D + zero-dimensional (0D) → 1D pseudo-polyrotaxane character, in which 1D [M2(H2L)] polygrids are threaded by free bpe/bpa. Complexes 56 are two-dimensional (2D) → 2D 2-fold parallel interpenetration structures with (6, 3) topology. 0D [M2(H2L)] grids of 56 are threaded by coordinated bpe/bpa from the other identical network. The structures display polyrotaxane and polycatenane character. Complex 7 is three-dimensional (3D) → 3D 4-fold parallel interpenetration. One-dimensional polygrids [M­(L)2] are threaded by coordinated bime from two other identical networks. They exhibit polyrotaxane, polycatenane, and helical character. When separated grids are threaded by coordinated bime from the same 3D network (8), a self-penetrated motif is formed. Related luminescent, thermogravimetric, and magnetic properties of these complexes are investigated here.