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A series of five-coordinated copper coordination polymers for efficient degradation of organic dyes under visible light irradiation

机译:一系列五配位铜配位聚合物,可在可见光照射下有效降解有机染料

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The copper(II) coordination polymers {[Cu4(OH)2(bix)2(1,2,4-btc)2(H2O)2]·3H2O}n (1), [Cu2(bix)(ip)2]n (2), [Cu2(bix)(Meip)2]n (3), {[Cu2(bix)(pbda)2]·H2O}n (4) and {[Cu2(bix)1.5(2,5-pydc)2(H2O)]·2H2O}n (5) were synthesized using the hydrothermal method (bix = 1,4-bis(2-methyl-imidazol-1-ylmethyl)benzene, 1,2,4-btc = 1,2,4-benzenetricarboxylate, ip = isophthalate, Meip = 5-methyl-isophthalate, pbda = 1,4-benzenediacatate, 2,5-pydc = 2,5-pyridine-dicarboxylate). 1 exhibits a (3,5)-connected 2D network with the point symbol of (42·6)(42·67·8) based on the [Cu2(μ-OH)] dimer. 2 exhibits the 2-fold interpenetrating three-dimensional pcu network based on the [Cu2(COO)4] dimers. 3 exhibits the 2-fold interpenetrating three-dimensional pcu network based on the [Cu2(COO)2] and [Cu2(COO)4] dimers. 4 shows an unusual 6-connected self-catenated 3D network with the point symbol of (44·610·8) based on [Cu2(COO)4] dimers. 5 exhibits a (3,4)-connected 2D network with the point symbol of (42·6)(42·63·8). 1–5 are semiconducting in nature, with Eg of 2.21 eV (1), 2.35 eV (2), 2.41 eV (3), 2.13 eV (4), and 2.62 eV (5). 1–5 are highly efficient and universal photocatalysts for the degradation of the organic dyes methylene blue (MB), rhodamine B (RhB) and methyl orange (MO) under visible light irradiation, and are very stable and easily separated from the reaction system for reuse. This work shows that the coordinated unsaturated copper coordination polymers should be very promising photocatalysts for degradation of organic dyes.
机译:铜( II )配位聚合物{[Cu 4 (OH) 2 (bix) 2 (1,2,4-btc) 2 (H 2 O) 2 ]·3H 2 O} < sub> n (1),[Cu 2 (bix)(ip) 2 ] n (2),[Cu 2 (bix)(Meip) 2 ] n (3 ),{[Cu 2 (bix)(pbda) 2 ]·H 2 O} n (4)和{[Cu 2 (bix) 1.5 (2,5-pydc) 2 (H 2 O)]·2H 2 O} n (5)使用水热法合成(bix = 1,4-双(2-甲基-咪唑-1-基甲基)苯,1,2,4-btc = 1,2,4-苯三羧酸酯,ip =间苯二甲酸酯,Meip = 5-间苯二甲酸甲酯,pbda = 1,4-苯二乙酸酯,2,5-pydc = 2,5-吡啶-二羧酸酯。 1展示了一个(3,5)连接的2D网络,其点符号为(4 2 ·6)(4 2 ·6 7 ·8)基于[Cu 2 (μ-OH)]二聚体。图2展示了基于[Cu 2 (small)(COO) 4 的2互穿的三维pcu网络]二聚体。图3展示了基于[Cu 2 (small)(COO) 2 的2互穿的三维pcu网络]和[Cu 2 (COO) 4 ]二聚体。图4显示了一个不寻常的6连接自连接3D网络,其点符号为(4 4 ·6 10 ·8)基于[Cu 2 (COO) 4 ]二聚体。 5展示了一个(3,4)连接的2D网络,其点符号为(4 2 ·6)(4 2 ·6 3 ·8)。 1–5本质上是半导体, E g 分别为2.21 eV(1),2.35 eV(2),2.41 eV(3) ,2.13 eV(4)和2.62 eV(5)。 1-5是高效和通用的光催化剂,可在可见光照射下降解有机染料亚甲基蓝(MB),若丹明B(RhB)和甲基橙(MO),并且非常稳定,易于与反应体系分离重用。这项工作表明,配位不饱和铜配位聚合物应该是降解有机染料的非常有前途的光催化剂。

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