Ten multifunctional cobalt(II) coordination polymers with the formulas of [Co(L 1 )0.5(5-AIP)]­·H2O (1), [Co(L 2 )­(5-AIP)­(H2O)2] (2), [Co(L 3 )0.5­(5-AIP)] (3), [Co(L 4 )0.5­(5-AIP)­(H2O)]­·2H2O (4), [Co(L 5 )­(5-AIP)] (5), [Co(HBTC)­(L 3 )]­·H2O (6), [Co(HBTC)­(L 6 )­(H2O)]­·3H2O (7), [Co(L 2 )­(1,3-BDC)­(H2O)2] (8), [Co2(L 3 )2­(1,3-BDC)2]­·4H2O (9), and [Co2(L 4 )1.5­(1,2-BDC)­(μ2-OH)­(μ3-OH)­(H2O)]­·H2O (10) have been prepared by a hydrothermal technique employing six flexible bis(pyridylamide) ligands with different spacers (L 1 = N,N′-bis(3-pyridyl)­oxamide, L 2 = N,N′-bis(3-pyridyl)­malonamide, L 3 = N,N′-di(3-pyridyl)­succinamide, L 4 = N,N′-bis(3-pyridyl)­adipamide, L 5 = N,N′-bis(3-pyridyl)­heptandiamide, L 6 = N ,N′-bis(3-pyridyl)­sebacicdiamide) and four aromatic polycarboxylic acids mixed ligands (5-H2AIP = 5-aminoisophthalic acid, H3BTC = 1,3,5-benzenetricarboxylic acid, 1,3-H2BDC = 1,3-benzenedicarboxylic acid, and 1,2-H2BDC = 1,2-benzenedicarboxylic acid). Compound 1 exhibits a two-dimensional (2D) double-layer network. Compounds 2 and 8 are isostructural and possess one-dimensional (1D) circle-connecting-circle chain structures derived from 1D [Co(L 2 )] n “Ω”-like chain and 1D [Co(5-AIP)] n ­/[Co(1,3-BDC)] n wavelike chain. Compound 3 possesses a 3,8-connected three-dimensional (3D) coordination framework with {42.6}2­{44.610.79.85} topology. Compound 4 is a 2D network containing a ladder-like chain. Compound 5 reveals a novel 3-fold interpenetrating CdSO4-like framework. Compound 6 is a double-layer coordination network with a (3,5)-connected {42·67·8}{42·6} topology. Complex 7 shows a 2D (4,4) grid layer. Compound 9 features a 2-fold interpenetrating 3D α-Po-related topological framework. Compound 10 is a 6-connected 3D coordination polymer with a {412.63} topology. The spacer length of the bis(pyridylamide) ligands, as well as the substituent group and carboxyl group number of polycarboxylates, shows a significant effect on the ultimate architectures of various cobalt(II) compounds 1–10. The electrochemical behaviors of carbon paste electrodes (CPEs) bulk-modified by compounds 1–10 and the electrocatalytic activities of 1-, 6-, 9-, 10-CPEs have been investigated. The photocatalytic properties of compounds 1–10 toward the degradation of methylene blue (MB) in visible light irradiation have been investigated. The variable temperature magnetic susceptibilities for compounds 3, 5, 9, and 10 indicate the existence of antiferromagnetic exchange interactions.

Thirteen new Cu II coordination polymers, namely, (1,3,5-HBTC)] ( 1), hexane, 1,3,5-H 3 BTC = 1,3,5-benzenetricarboxylic acid, 1,2-H 2 BDC = 1,2-benzenedicarboxylic acid, 1,3-H 2 BDC = 1,3-benzenedicarboxylic acid and 1,4-H 2 NDC = 1,4-naphthalenedicarboxylic acid]. Complexes 1−3 based on the same auxiliary ligand show various structures. Complex 1 features a one-dimensional (1D) ∞-like double-chain structure, which consists of a [Cu-1,3,5-HBTC] n chain and [Cu-3-dppa] n meso-helical chain. Complex 2 possesses a (2,4) undulated honeycomb (hcb) net. Complex 3 is a 3-fold interpenetrating three-dimensional (3D) framework, which shows trinodal (2,3,3)-connected topology with the Schlafi symbol of (10•12 2 ) 2 (10 3 ) 2 (12). Complexes 4−6 with 1,2-BDC as secondary ligand exhibit different two-dimensional (2D) layer structures. Complex 4 exhibits a 2D (2,4)-connected (4•12 4 •14)(4) net. Complexes 5 and 6 have similar structures and show 2D networks with undulated sql topology. For complexes 7−10 based on 1,3-BDC secondary ligand, complex 7 shows a 1D zigzag chain, while complexes 8−10 have similar wave-like 2D structures. When 1,4-NDC was used as the auxiliary ligand, complex 11 is a 2D puckered (4,4) network, complex 12 reveals a 4-connected topology with the point symbol of (4 4 •6 2 ), while complex 13 exhibits a 3-fold interpenetrating 3D α-Po framework. The structural diversity indicates that the bis-pyridyl-bis-amide ligands with different spacers and the aromatic polycarboxylates play important roles in tuning the dimensionalities and structures of the title complexes. The fluorescent and photocatalytic properties for 1−13 have also been investigated in detail.

Three new 2D copper(ii) complexes [Cu(NIPH)(L)] (1), [Cu(BDC)(L)(H2O)] (2), and [Cu(HBTC)(L)]·2H2O (3) were hydrothermally synthesized by self-assembly of aromatic polycarboxylates (H2NIPH = 5-nitroisophthalic acid, H2BDC = 1,3-benzenedicarboxylic acid, H3BTC = 1,3,5-benzenetricarboxylic acid) and the flexible bis(pyridylamide) ligand L (L = N,N′-di(3-pyridyl)succinamide), and structurally characterized by single crystal X-ray diffraction, and elemental, IR, and thermogravimetric analyses. Compound 1 is a 2D coordination polymer based on tri-flexural helix chains (left-, right-handed [Cu-L]n helix chains, and left-handed Cu-NIPH helix chain). Compound 2 exhibits a 2D wavelike polymeric layer structure constructed from a 1D [Cu-L]n sinusoidal chain and a 1D [Cu-BDC]n V-like chain. Compound 3 possesses a 2D double-layer network formed from 1D [Cu-L]n zigzag chains and 1D [Cu-HBTC]2n double chains. The fluorescent properties of the three compounds and the electrochemical behaviour of compound 2-bulk-modified carbon paste electrode were also studied.

Ten metal–organic coordination polymers 1–10 based on semi-rigid bis-pyridyl-bis-amide ligands have been synthesized. The fluorescence sensing and photocatalytic properties of 1–10 have been investigated.

Role of aromatic dicarboxylates in the structural diversity of cobalt(II) and copper(II) coordination polymers containing a flexible N,N9-di(3pyridyl)octanediamide ligand3

Two new 3D coordination complexes [Cd(3-bpcd)(pht)] (1) and [Zn(3-bpcd)(pht)] (2) [3-bpcd = N,N'-bis(pyridin-3-yl)cyclohexane-1,4-dicarboxamide, H 2 pht = phthalic acid] have been hydrothermally synthesized. X-ray diffraction analysis reveals that the complexes 1 and 2 represent a 4-connected diamondoid topology with a 3-fold interpenetrating feature. Moreover, the fluorescent properties of complexes 1 and 2 are studied.

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