ZnII coordination polymers constructed with malonate and bipyridyl ligands: Photoluminescence and heterogeneous catalytic reactivity

2016

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In the title compound, {[Zn(C6H4O4)(C10H9N3)]·H2O}n, the di(pyridin-2-yl)amine (dpa) ligands chelate the ZnIIions, forming [Zn(dpa)]2+units which are connected by two independent bridging muconate [(2E,4E)-hexa-2,4-dienedioate] ligands to form chains. A crystallographic inversion centre is located at the mid-point of the central C—C bond of each muconate ligand. The carboxylate groups of the muconate ligands bridge the ZnIIions in asymmetric chelating modes. The ZnIIion is coordinated by four O atoms of two chelating carboxylate groups and two pyridyl N atoms in a distorted octahedral coordination environment. In the crystal, N—H...O and O—H...O hydrogen bonds connect chains and solvent water molecules, forming a two-dimensional network parallel to (101).

Section: Figurementioning

confidence: 93%

catena-Poly[[[[bis(pyridin-2-yl-κN)amine]zinc(II)]-μ₂-(2E,4E)-hexa-2,4-dienedioato-κ⁴O¹,O^1′:O⁶,O^6′] monohydrate]

2016

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“…,!-alkanedicarboxylates, have been shown to be particularly suitable as ligands in MOFs of various topologies. Recently, various MOFs containing these ,!-alkane(or alkene)dicarboxylate ligands have been reported (Hyun et al, 2013;Hwang et al, 2012Hwang et al, , 2013Lee et al, 2014;Kim et al, 2017), athough they are less frequently employed in MOFs than aromatic dicarboxylates. We report herein the crystal structure of poly[[[ 2 -1,4-bis(pyridin-4-yl)butane]bis( 4pentanedioato)dicopper(II)] acetonitrile disolvate].…”

Section: Structure Descriptionmentioning

confidence: 99%

Two-dimensional structure of poly[[[μ₂-1,4-bis(pyridin-4-yl)butane]bis(μ₄-pentanedioato)dicopper(II)] acetonitrile disolvate]

2017

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2 )]Á2CH 3 CN} n , the Cu 2 dinuclear units are connected by glutartate ligands, forming one-dimensional double chains. These chains, are in turn bridged by 1,4-bis(pyridin-4-yl)butane ligands to form a two-dimensional layer structure parallel to (112). The carboxylate groups of the glutarate ligand bridge two copper(II) ions, forming a paddle-wheel-type Cu 2 (CO 2 ) 4 dinuclear secondary building unit. A crystallographic inversion centre is located midway between two Cu II ions, with a CuÁ Á ÁCu distance of 2.639 (3) Å . The coordination geometry of the unique Cu II ion is slightly disorted square pyramidal, formed by four equatorial carboxylate O atoms and an axial pyridyl N atom. Structure descriptionMetal-organic frameworks (MOFs) have been constructed using metal ions and polytopic bridging ligands, and MOFs usually provide high surfaces and large pore volumes, and are thereby suitable for various advanced applications, such as selective gas sorption, heterogeneous catalysis, separation, sensors, drug delivery and biological imaging. Flexible dicarboxylates, as well as rigid aromatic dicarboxylates, have been used for the synthesis of MOFs, and flexible dicarboxylates, e.g. ,!-alkanedicarboxylates, have been shown to be particularly suitable as ligands in MOFs of various topologies. Recently, various MOFs containing these ,!-alkane(or alkene)dicarboxylate ligands have been reported (Hyun et al., 2013;Hwang et al., 2012Hwang et al., , 2013Lee et al., 2014;Kim et al., 2017)

“…have been prepared and their structures determined (Hyun et al 2013). Zn-MOFs containing five flexible ,!-alkane-(or alkene-)dicarboxylates and bipyridyl ligands have also been synthesized and their structures determined (Hwang et al, 2013;Kim et al, 2017).…”

Section: Data Reportsmentioning

confidence: 99%

Poly[[(μ₂-but-2-ynedioato)[μ₂-1,2-(pyridin-4-yl)ethylene]zinc(II)] dihydrate]

2017

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In the title compound, poly [[( 2 -oxalato)[ 2 -1,2-(pyridin-4-yl)ethylene]-zinc(II)] dihydrate], {[Zn( 2 -C 4 O 4 )( 2 -C 12 H 10 N 2 )]Á2H 2 O} n , 2-butyndioate and 1,2-bis(pyridin-4-yl)ethylene ligands bridge Zn II ions to form a three-dimensional network. The three-dimensional networks are fivefold interpenetrated, and each network features a 4-connected unimodal net with a Schlä fli symbol of 6 6 (dia) with the Zn II ions as the nodes. Twofold rotation axes are located at the Zn II ions and the midpoints of the C C bond of 2-butyndioate and the C C bond of 1,2-bis(pyridin-4-yl)ethylene. The coordination geometry around the Zn II ions is tetrahedral constructed from two O atoms from 2-butyndioate and two N atoms from 1,2-bis(pyridin-4-yl)ethylene. Solvate water molecules are connected with each other via hydrogen bonds to create chains running parallel to [010] that are captured in infinite channels of the three-dimensional framework through hydrogen bonds to the non-coordinating carboxylate O atoms of the 2-butyndioate units. The water molecules are disordered, with two alternative positions that are distinguished by the direction of the chains, but that share the H atom hydrogen bonded to the carboxylate O atom. Structure descriptionRigid aromatic dicarboxylates have been used for the synthesis of MOFs (metal-organic frameworks), providing high surface areas and large pore volumes suitable for various advanced applications. Flexible dicarboxylates as well as rigid aromatic dicarboxylates have been paid attention in the design of new MOFs. Recently, various MOFs containing flexible ,!-alkane (or alkene)-dicarboxylates have been reported: three-dimensional Zn II frameworks containing malonates and various bipyridyl pillars [4,4-bipyridine, 1,2-bis(pyridin-4-yl)ethane, 1,2-bis(pyridin-4-yl)ethylene, and 1,3-bis(pyridin-4-yl)propane]