Crystal structure of catena-triaqua(5-methoxyisophthalate)- cadmium(II)—water (1:2), [Cd(C9H6O5)(H2O)3] · 2H2O

Abstract

Source of materialThetitle compound was prepared under hydrothermal conditions. Am ixture of 5-methoxyisophthalate (0.1 mmol), Cd(ClO 4 ) 2 (0.1 mmol), NaOH (0.1mmol) and H 2 O(15 mL) was placed in a Teflon-lined stainless-steel vessel, heated to 170°C for 4days, and then cooled to room temperature for 24 h. Colorless blockshaped crystals of the title complex were obtained. DiscussionThe design and preparation of metal-organic frameworks (MOFs) has become an attractive research field. The motivation comes notonly from their application as functional materials but is also due to the intriguing structural architectures [1][2][3][4].Inprinciple, the mosteffective approach for the construction of MOFs is to rationally modify the building blocks and to control the assembled motifs for required products via selecting different organic ligands [5,6]. 5-methoxyisophthalate (CH 3 O-H 2 ip) may serve as as uitable building block to construct novel coordination polymers due to the existence of anoncoordinating CH 3 Ogroup on the aromatic backbone, which will have aprofound impact on the electron density of such aligand and therefore different physical and chemical properties [7][8][9]. The asymmetric unit of the title crystal structure consists of aCd 2+ ion, aCH 3 O-ip ligand, three coordinated water molecules and two free waterm olecules.T he Cd 2+ ion is chelated by four oxygen atomsfrom carboxylate of CH 3 O-ip ligand forming two chelating rings, and the oxygen atomsfrom three coordinated water moleculesc ompletet he seven-fold coordination at the metal center. Thus,the coordination geometry aboutCd 2+ ion can be described as adistorted pentagonal bipyramid. Four chelating carboxylate oxygens and an oxygen from water complete the equatorial plane, while the other two oxygens from water form the pyramidal apices with bond angles ÐO7-Cd1-O8 =170.7(1)°. TheCd-O bond lengths are in the range of 2.275(3) -2.397(3) Å. The CH 3 Oip ligand takes the bidentate-chelating coordination mode to bridge the neighbouring Cd 2+ ions and yield achain. These chains are assembled by hydrogen bonds between coordinated water molecules and free water molecules to afford athree-dimensional supramolecularstructure. Thebondlengths andanglesofthese hydrogen bondingp arameters arei nt he range of 1.95(2) -3.03(1) Åand 120.3 -179.3°, respectively. It is obvious that the water and ethanol molecules make acrucial contribution to the stability of the host.

High Brightness and Easy Color Modulation in Lanthanide-Based Coordination Polymers with 5-Methoxyisophthalate as Ligand: Toward Emission Colors Additive Strategy

“…To the best of our knowledge, some coordination polymers based on (mip) 2– ligand and involving transition metal ions have recently been reported − but, to date, none of them involves lanthanide ions. We want to report here the first three series of lanthanide-containing coordination polymers based on this ligand.…”

Crystal structure of poly-[tetraaquabis(μ8-benzene-1,2,4,5-tetracarboxylato-1κ3 O 4:O 6:O 8:2κ4 O 2:O 2:O 5:O 5:3κ4 O 1:O<

“…[1][2][3][4][5][6]. The most e ective and facile approach for constructing new CPs is the judicious choice of various organic linkers such as benzenecarboxylates and N-donor ligands.…”

Coordination Polymers of 5-Alkoxy Isophthalic Acids

“…Despite the comparatively large number of coordination frameworks with reported crystal structures in which 5-methoxy isophthalic acid acts as the sole bridging ligand, ,− only two coordination frameworks have been reported to date which contain longer alkyl chain substituents on the phenolic oxygen atom . The related 5-benzyloxy isophthalic acid has received more attention, with isostructural 3D frameworks of composition M 2 ­(BzOip) 2 ­(H 2 O) (M = Co or Zn) prepared from aqueous solution, and a Kagome lattice of composition Cu­(BzOip)­(pyr) .…”