Syntheses and crystal structures of copper complexes of 7,16-bis (5-t-butyl-2-hydroxybenzyl)-1,4,10,13-tetraoxa-7,16-diazacyclooctadecane |
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| Affiliation: | 1. Department of Chemistry, Faculty of Science, Alexandria University, P.O. Box 426, Ibrahimia, Alexandria, 21321, Egypt;2. Department of Chemistry, Rabigh College of Science and Arts, P.O. Box 344, King Abdulaziz University, Jeddah, Saudi Arabia;3. Department of Chemistry, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland;4. Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia;5. Chemistry Department, Faculty of Science, Suez Canal University, Ismailia, 41522, Egypt;1. Department of Chemistry, Aligarh Muslim University, Aligarh, 202002, India;2. Department of Chemistry, Indian Institute of Technology Guwahati, 781039, India;3. Institute of Industry Academy Cooperation Foundation, Dongguk University, Gyeongju, Republic of Korea;4. Department of Advanced Materials Chemistry, Dongguk University, Gyeongju, Republic of Korea;1. PG & Research Department of Chemistry, Nehru Memorial College, Puthanampatti, Tiruchirappalli, Tamilnadu 621 007, India;2. PG & Research Department of Chemistry, V.H.N.S.N. College, Virudhunagar, Tamilnadu 626 001, India;1. Ruđer Bošković Institute, NMR Centre, Bijenička cesta 54, HR-10000 Zagreb, Croatia;2. University of Rijeka, Department of Biotechnology, Radmile Matejčić 2, HR-51000 Rijeka, Croatia;3. Slovenian NMR Centre, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia;4. EN-FIST Center of Excellence, Trg OF 13, SI-1000 Ljubljana, Slovenia;5. University of Ljubljana, Faculty of Chemistry and Chemical Technology, Večna pot 113, SI-1000 Ljubljana, Slovenia;6. University of Zagreb, Faculty of Science, Department of Chemistry, Horvatovac 102a, HR-10000 Zagreb, Croatia |
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| Abstract: | Reaction of the crown ether ligand H2L (H2L=7,16-bis (5-t-butyl-2-hydroxybenzyl)-1,4,10,13-tetraoxa-7,16-diazacyclooctadecane) with Cu(Ac)2 and Cu(NO3)2 affords complexes 1 and 2, respectively, which are characterized by elemental analysis, IR and UV–Visible spectroscopy and X-ray diffraction. Both crystal structure analysis and spectroscopy study unexpectedly showed that the two side-arm p-tert-butylphenols of the original crown ether are converted to nitro p-tert-butylphenols in complex 2. In each complex the copper (II) ion is coordinated to two nitrogen and four oxygen atoms, two from the crown ether ring and other two from the deprotonated phenolate groups, which define an elongated octahedron. Electrochemical studies indicate that the two complexes undergo irreversible reduction in DMF solution. |
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