Five new 2D and 3D coordination polymers based on two new multifunctional pyridyl–tricarboxylate ligands: hydrothermal syntheses, structural diversity, luminescent and magnetic properties. Issue 31 (30th March 2017)

• Record Type: Journal Article
• Authors: Guo, Xiao-Yu; Zhao, Fei; Liu, Hou-Ting; Wang, Yan-Qin; Liu, Zhi-Liang; Gao, En-Qing
• Is Part Of: RSC advances. Volume 7:Issue 31(2017)
• Page Start: 19039
• Page End: 19049
• Publication Date: 2017-03-30
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra02063e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Five new Zn(ii ), Cd(ii ), Co(ii ) and Mn(ii ) MOFs based on two novel multifunctional pyridyl–tricarboxylate ligands: structures, luminescent and magnetic properties. Abstract : Five coordination polymers based on pyridine–tricarboxylate ligands formulated as [Zn(HL1)] (1 ), [Cd2 (L1)(phen)2 (OH)]·2H2 O (2 ), [Co(HL1)(H2 O)2 ] (3 ), [Co3 (L1)2 (H2 O)8 ]·4(H2 O) (4 ) and [Mn3 (L2)2 (4, 4′-bpy)2 (H2 O)2 ] (5 ) (H3 L1 = 4-(2, 4-dicarboxylphenyl) picolinic acid, H3 L2 = 5-(3′, 5′-dicarboxylphenyl) nicotinic acid, phen = 1, 10-phenanthroline, 4, 4′-bpy = 4, 4′-bipyridine) were synthesized under hydrothermal conditions. Compound1 exhibits a 2D distorted square-grid network based on [Zn(μ-Ocarboxylate )(COO)] n chains. Compound2 displays a 2D square-grid network based on tetranuclear [Cd4 (μ3 -OH)2 (Ocarboxylate )2 (COO)2 ] units in which Cd(ii ) ions are bridged by the mixed bridges of (μ3 -OH)2 (μ-Ocarboxylate )2 . Compound3 exhibits a 2D network based on [Co(COO)] n chains in which Co(ii ) ions are bridged by a single syn – anti carboxylate bridge (μ-COO). Compound4 features a 3D framework based on 2D layers which are further interlinked by Co(ii ) ions, containing [Co(COO)] n chains which Co(ii ) ions are also bridged by a single syn – anti carboxylate bridge similar with that in3 . Compound5 shows a 2D network based on trinuclear [Mn3 (COO)6 (H2 O)2 ] units in which Mn(ii ) ions are bridged by the mixed bridges of (μ-Ocarboxylate )(COO)2 . These compounds have been characterized by IR spectra, TGA and powder XRD pattern. Compounds1 and2 exhibit intense luminescence properties in the solid state at room temperature. Magnetic studies for compounds3–5 demonstrated that the single carboxylate bridge in3 and4 transmits weak antiferromagnetic interactions between Co(ii ) ions while the mixed bridges of (μ-Ocarboxylate )(COO)2 transmit moderate antiferromagnetic interactions between Mn(ii ) ions in5 .