Structural diversity, magnetic properties, and luminescence sensing based Ni()/Zn() coordination polymers of the semirigid 3,3′-((5-carboxy-1,3-phenylene)bis(oxy))dibenzate ligand

• Published in: CrystEngComm Vol. 22; no. 31; pp. 527 - 5217
• Main Authors: Yang, Dong-Dong, Lu, Li-Ping, Zhu, Miao-Li
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 21.08.2020
• Subjects: Aqueous environments; Aqueous solutions; Benzene; Coordination polymers; Crystallography; Ferromagnetism; Fluorescent indicators; Infrared analysis; Infrared spectroscopy; Isomorphism; Luminescence; Luminescence quenching; Magnetic properties; Recyclability; Single crystals; Thermogravimetric analysis; Topology
• ISSN: 1466-8033; 1466-8033
• DOI: 10.1039/c9ce01998g

Two two-dimensional Ni( ii ) or Zn( ii )-based coordination polymers, namely [[Ni 3 (μ 4 -cpboda) 2 (μ 2 -H 2 O) 2 (DMF) 2 (H 2 O) 2 ]·3DMF·2HCOOH·2H 2 O] n ( 1 ) and [[Zn 3 (μ 4 -cpboda) 2 (μ 2 -H 2 O) 2 (DMF) 2 (H 2 O) 2 ]·3DMF·3HCOOH·3H 2 O] n ( 2 ), a three-dimensional Ni( ii )-based coordination polymer, namely [[Ni 3 (μ 3 -cpboda) 2 (1,4-bib) 5 (H 2 O) 2 ]·DMF] n ( 3 ), and a dinuclear Zn( ii ) complex, namely [Zn (μ 2 -Hcpboda)(2,2-bipy)(H 2 O)] 2 ( 4 ) (H 3 cpboda = 3,3′-((5-carboxy-1,3-phenylene)bis(oxy))dibenzoic acid, 2,2-bipy = 2,2-bipyridine, 1,4-bib = 1,4-di(1 H -imidazol-1-yl)benzene), were successfully synthesized under solvothermal conditions and characterized via single-crystal X-ray and powder diffraction analyses, elemental analyses (EA), FT-IR spectroscopy, and thermogravimetric analysis (TGA). Complexes 1 and 2 show isomorphism and (3,4,6)-connected 2D sheet structures with the (3 2 ·4) 2 (3 2 ·8 3 ·9) 2 (3 4 ·4· 2 8 2 ·9 4 ·10 3 ) topology. Complex 3 is a 4,4,7-connected 3D structure with the (4 2 ·5 2 ·6 2 ) 2 (4 6 ·5·6 14 ) 2 (5 4 ·6·8) topology. Complex 4 is only a simple dinuclear structure. Magnetization measurements disclose the weak ferromagnetic behavior between Ni( ii ) ions in the complexes 1 and 3 . Fluorescence measurements indicate that 2 and 4 exhibit fast, sensitive, and selective luminescence quenching responses towards Cr 2 O 7 2− /CrO 4 2− in an aqueous solution. The limit of detection for Cr 2 O 7 2− /CrO 4 2− ions were estimated to be 0.51 and 0.60 ppm for 2 (0.89 and 1.03 ppm for 4 ), respectively, which are comparable to those reported for the CP-based fluorescent probes that can simultaneously detect Cr 2 O 7 2− /CrO 4 2− in aqueous environments. Moreover, 2 and 4 can be easily regenerated after the detection experiments, which is indicative of the excellent recyclability. All these results suggest that complexes 2 and 4 are highly selective and recyclable luminescence sensing materials for the quantitative detection of Cr 2 O 7 2− /CrO 4 2− anions in aqueous solutions. Four novel CPs were synthesized and two Zn( ii )-CPs can be used as fluorescent probes for the detection of CrO 4 2− /Cr 2 O 7 2− .