Search

A bifunctional cationic metal–organic framework {[Cu9(OH)6Cl2(itp)6(1,4-bdc)3](NO3)2(OH)2·20H2O}n (1-NO3-OH·20H2O) was synthesized and characterized (itp = 1-imidazol-1-yl-3-(1,2,4-triazol-4-yl)propane, 1,4-bdc = 1,4-benzenedicarboxylate). In 1-NO3-OH·20H2O, three [Cu3(μ3-OH)(μ2-OH)] trimeric clusters are bridged by two μ3-Cl and form a [Cu9(μ3-OH)3(μ2-OH)3(μ3-Cl)2] cluster. Such a nonanuclear copper(ii) cluster [Cu9(μ3-OH)3(μ2-OH)3(μ3-Cl)2] has not been reported till now, at least to the best of our knowledge. 1-NO3-OH·20H2O showed a 6-connected 2D 36-hxl net based on a nonanuclear copper(ii) cluster [Cu9(μ3-OH)3(μ2-OH)3(μ3-Cl)2]. 1-NO3-OH·20H2O is also the first 2D 36-hxl net-based nonanuclear cluster. 1-NO3-OH (guest-free phase) showed fast and highly efficient Cr2O72− and CrO42− trapping, and good recyclability for capturing Cr2O72− and CrO42−. The adsorption capacities of 1-NO3-OH to capture Cr2O72− and CrO42− were 1.762 mol mol−1 (154.8 mg g−1) and 1.896 mol mol−1 (89.5 mg g−1), respectively, at a molar ratio of 1 : 2 (1-NO3-OH to 2.5 × 10−3 mol L−1 Cr2O72− or CrO42−). 1-NO3-OH exhibited the selective sorption of Cr2O72− or CrO42− from a solution containing a mixture of Cr2O72− or CrO42− and a ten-fold molar amount of ClO4−, NO3−, Cl−, BF4− or a five-fold molar amount of mol L−1 SO42−. 1-NO3-OH could capture 87.9% dilute Cr2O72− or 91.8% dilute CrO42− at an equimolar 1-NO3-OH to 20 ppm Cr2O72− or CrO42−. 1-NO3-OH·20H2O exhibited a highly efficient photocatalytic degradation of the cationic organic dyes methylene blue (MB) and rhodamine B (RhB) under visible light irradiation, and was shown to be a good photocatalyst for photocatalytic degradation of the cationic organic dyes. [ABSTRACT FROM AUTHOR]

Seven coordination polymers, [Co(bix)(ndc)] n ( 1 ), [Co 2 (bix)(glu) 2 ] n ( 2 ), {[Zn(bix)(male)]·H 2 O} n ( 3 ), [Zn 2 (bix)(pim) 2 ] n ( 4 ), [Zn(bix)(aze)] n ( 5 ), {[Zn(bix)(mbda)]·H 2 O} n ( 6 ) and [Zn(bix)(adc)] n ( 7 ), were synthesized (bix = 1,4-bis(2-methyl-imidazol-1-methyl)benzene, ndc = 1,4-naphthalenedicarboxylate, glu = glutarate, male = maleicate, pim = pimelate, aze = azelaicate, mbda = 1,3-benzenediacetate, adc = 1,3-adamantanedicarboxylate). 1 shows an unusual 4-connected self-catenated 3D network. 2 is a 6-connected self-catenated 3D network based on the [Co 2 (COO) 4 ] unit. 3 shows a special 2D (6,3) network, with six Zn(II) atoms at six corners and four bix and two double male ligands at six edges. 4 is a (3,4)-connected 3D network. 5 and 6 show the 2D (4,4) network. 7 consists of one-dimensional chains containing two alternative kinds of rings, [Zn 2 (adc) 2 ] and [Zn 2 (bix) 2 ]. The diverse structures indicate that the structures of the coordination polymers can be tuned by the right combination of appropriate flexible bis(imidazole) ligand, bix, the metal ions and dicarboxylate ligands. 1 and 2 are effective photocatalytic catalysts for the degradation of methyl orange. The luminescence of 3 – 7 and thermal stability of 1 – 7 were also investigated. [ABSTRACT FROM AUTHOR]

An unusual coordination polymer [Cu 4 (OH) 2 (otrb) 2 (sip) 2 ] n ( 1 ) was synthesized by the hydrothermal method (otrb = 1,2-bis(1,2,4-triazol-4-ylmethyl)benzene, sip = 5-sulfoisophthalate). The tetranuclear copper(II) clusters [Cu 4 (OH) 2 ] are bridged by the double sip and double otrb ligands to form an unusual 2D sql network. The adjacent 2D networks parallel interpenetrate each other to form intriguing 2-fold interpenetrated network. The photocatalytic degradation rates of methyl orange (MO), methylene blue (MB) and rhodamine B (RhB) are 94.4%, 91.2% and 86.6% at 180 min using photocatalyst 1 . 1 is a highly efficient and universal photocatalyst for the degradation of the organic dyes. [ABSTRACT FROM AUTHOR]

Seven cobalt(II) coordination polymers [Co(obtz)(Meip)] n ( 1 ), [Co(obtz)(ip)] n ( 2 ), {[Co 2 (obtz) 2 (tdc) 2 (H 2 O)]·2H 2 O} n ( 3 ), [Co(obtz)(1,4-bdc)(H 2 O)] n ( 4 ), [Co(obtz)(adc)] n ( 5 ), {[Co(obtz) 2 (fum)]·2H 2 O} n ( 6 ) and [Co(obtz)(hip)] n ( 7 ) (obtz = 1,2-bis(1,2,4-triazole-1-ylmethyl)benzene, Meip = 5-methylisophthalate, ip = isophthalate, tdc = 2.5-thiophenedicarboxylate, 1,4-bdc = 1,4-benzenedicarboxylate, adc = 1,3-adamantanedicarboxylate, fum = fumarate, hip = 5-hydroxyisophthalate) were synthesized. 1 shows a (3,4)-connected 2D network with the point symbol of (3·8 2 )(3 2 ·4·8 2 ·9). 2 exhibits a (3,5)-connected 2D network with the point symbol of (4 2 ·6)(4 2 ·6 6 ·8 2 ). 3 presents a (3,6)-connected 2D network with the point symbol of (3·4·6)(3 2 ·4 4 ·5 4 ·6 3 ·7·8). 4 and 5 exhibit unusual 2D → 2D polycatenated network based on 2D sql network. 6 shows a 2D sql network. 7 presents the ladder-like 1D chain with side arms. The diverse structures demonstrate that the structures of coordination polymers can be tuned by the dicarboxylate and bis(triazole) co-ligands. The thermal stability of 1 – 7 was investigated. 1 – 7 are effective photocatalytic catalysts for the degradation of methyl orange. [ABSTRACT FROM AUTHOR]

A copper(II) coordination polymer {[Cu(itp)(ip)][Cu 4 (OH) 2 (itp)(ip) 3 ]·4H 2 O} n ( 1 ) (itp = 1-imidazol-1-yl-3-(1,2,4-triazol-4-yl)propane, ip = isophthalate) was synthesized and characterized. 1 exhibits an intriguing 2-fold interpenetrating array of (4,6)-coordinated 3D nets of the fsc topological type, which are based on the 4-coordinated single copper(II) and 6-coordinated tetranuclear hydroxy copper(II) [Cu 4 (μ 3 -OH) 2 ] cluster. 1 is a highly efficient and universal photocatalyst for the degradation of the organic dyes methylene blue (MB), rhodamine B (RhB) and methyl orange (MO) under visible light irradiation. Electrochemical performance of 1 was also measured. [ABSTRACT FROM AUTHOR]