Copper (II) adsorption property of 1D coordination polymer [Cu2(H2O)(bipy)2(tp)2]  (bipy = 2,2'-bipyridine, tp = terepthalate) after acid treatment

Winya Dungkaew; Suwadee Jiajaroen; Chatphorn Theppitak; Darunee Sertphon; Kittipong Chainok

Authors

Winya Dungkaew Department of Chemistry, Faculty of Science, Mahasarakham University, Kantarawichai, Maha Sarakham 44150, Thailand
Suwadee Jiajaroen Department of Chemistry, Faculty of Science, Mahasarakham University, Kantarawichai, Maha Sarakham 44150, Thailand & Department of Chemistry, Faculty of Science and Technology, Thammasat University, Pathum Thani 12121, Thailand
Chatphorn Theppitak Department of Chemistry, Faculty of Science and Technology, Thammasat University, Pathum Thani 12121, Thailand
Darunee Sertphon Department of Chemistry, Faculty of Science, Rangsit University, Pathum Thani 12000, Thailand
Kittipong Chainok Materials and Textile Technology, Faculty of Science and Technology,Thammasat University, Pathum Thani 12121, Thailand

Keywords:

after acid treatment, coordination polymer, Copper (II), Cu2 adsorption, single crystal X-ray diffraction, terephthalic acid

Abstract

A deep-blue crystal of terepthalato-bridged copper (II) coordination polymer (CP), [Cu₂(H₂O)(bipy)₂(tp)₂] (1) was synthesized using hydrothermal reactions of Cu(OAc)₂·H₂O, terephthalic acid (H₂tp), 2,2¢-bipyridine (bipy), at pH ~8.45 in NH₄OH. Single crystal X-ray diffraction analysis at room temperature revealed that complex 1 crystallizes in monoclinic space group P2₁/c with unit cell parameter a = 12.19720(10) Å, b = 14.78360(10) Å, c = 11.25080(10) Å, b = 91.5460(10)°, V = 2027.99(3) Å³, and Z = 4. Complex 1 shows a one-dimensional zigzag chain along the [001] direction constructed by the tp²⁻ ligand linked to adjacent Cu²⁺ ions through the carboxylate groups, while the bipy acts as bidentate chelating ligand. Classical O-H∙∙∙O hydrogen bonds are observed. The synthesized product was acid-treated via immersion in 1%v/v HNO₃, and within minute white crystals with retained morphology was obtained. Subsequently, the white acid-treated crystals were tested for their Cu²⁺ adsorption. Cu²⁺ adsorption of the white acid-treated crystals was fast and high. Adsorption as high as 214 mg Cu²⁺/g adsorbent can be obtained from material prepared from acid treated of 1D polymeric chain.

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