ISSN 2630-0583 (Print)

ISSN 2630-0656 (Online)

JCST

Journal of Current Science and Technology

http://jcst.rsu.ac.th

Journal of Current Science and Technology. Vol.9 No.1 , January - June 2019.

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, and Kittipong Chainok

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.

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

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