Abstract
Two coordination polymers (CPs), with chemical formulas {[Ni2(bpp)2(BT)(H2O)6] 1.5(EtOH) 1.5H2O}n (1) and [Zn(bpp)(BT)0.5]·5H2O (2) (bpp = 1,3-bis(4-pyridyl)propane, and BT4− = tetraanion of 1,2,4,5-Benzenetetracarboxylic acid), have been synthesized and structurally characterized by single-crystal X-ray diffraction methods. In compound 1, the coordination environments of two crystallographically independent Ni(II) ions are both distorted octahedral bonded to two nitrogen donors from two bpp ligands and four oxygen donors from one BT4- ligand and three water molecules. Both bpp and BT4− act as bridging ligands with bis-monodentate and 1,4-bis-monodentate coordination modes, respectively, connecting the Ni(II) ions to form a 2D layered metal-organic framework (MOF). Adjacent 2D layers are then arranged orderly in an ABAB manner to complete their 3D supramolecular architecture. In 2, the coordination environment of Zn(II) ion is distorted tetrahedral bonded to two nitrogen donors from two bpp ligands and two oxygen donors from two BT4− ligands. Both bpp and BT4- act as bridging ligands with bis-monodentate and 1,2,4,5-tetrakis-monodentate coordination modes, respectively, connecting the Zn(II) ions to form a 3D MOF. The reversible water de-/adsorption behavior of 1 between dehydrated and rehydrated forms has been verified by cyclic Thermogravimetric (TG) analyses through de-/rehydration processes. Compound 1 also exhibits significant water vapor hysteresis isotherms.
Highlights
Coordination compounds with open two-dimensional (2D) or three-dimensional (3D) polymeric metal-organic frameworks (MOFs) [1,2] containing guest solvent molecules are attractive research fields, owing to their designable structure with unusual flexibilities and to their tunable functional application [3,4,5,6,7,8], which provide the possibility for developing advanced functional materials for assemblies of guest molecules in confined spaces [9,10]
BT4−, which ligand, possesses a rigidas aromatic multi-carboxylate structure, hasrelevant been used as a poly-functional including a bridging as multi-carboxylate a poly-functional ligand, including as used a bridging ligand with various coordination modes to build structure, has been as a poly-functional ligand, including a bridging ligand with various coordination modes to build up many coordination polymers (CPs) or MOFs withasnovel extended upligand many with
Architecture is built up via the assembly of 2D MOFs, which are constructed through the bridges supramolecular architecture is built up via the assembly of 2D MOFs, which are constructed of Ni(II) with 1,4-bis-monodentate bpp and BT4− ligands
Summary
Coordination compounds with open two-dimensional (2D) or three-dimensional (3D) polymeric metal-organic frameworks (MOFs) [1,2] containing guest solvent molecules are attractive research fields, owing to their designable structure with unusual flexibilities and to their tunable functional application [3,4,5,6,7,8], which provide the possibility for developing advanced functional materials for assemblies of guest molecules in confined spaces [9,10]. BT4−, which possesses a rigid aromatic polymers (CPs) [11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27]. 0.5]·5H2O (2), in which the BT4− ligands act as the bridging ligands with two kinds of coordination modes, 1,4-bis-monodentate in in. 1,2,4,5-tetrakis-monodentate in (shown in Scheme and bpp as a ligand bridging ligand with bis-monodentate coordination mode, 2), 2), and2), the bppthe acts as aacts bridging with bis-monodentate coordination mode, connecting. Scheme and bpp as a bridging ligand bis-monodentate coordination connecting thethe.
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