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  • 02월 19일 10시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제121회 대한화학회 학술발표회, 총회 및 기기전시회 안내 New Ni(II), Zn(II) and Co(II) Heptameric Cluster Systems from Dialdehyde

2018년 2월 2일 14시 31분 16초
INOR.P-49 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 19일 (목요일) 11:00~12:30
Inorganic Chemistry
저자 및
Ume Farwa, Junseong Lee*
Department of Chemistry, Chonnam National University, Korea
We report the three polymetallic heptameric complexes [Ni7L63-OH)6].(ClO4)2 (1), [Zn7L63-OCH3)6].(ClO4)2 (2) and [Co7L63-OH)6]. (ClO4)2, (3), where L=4-tert-Butyl-2,6-diformylphenol. These heptametallic complexes are characterized by IR, NMR (for 3), EA, ESI-MS and X-ray single crystal diffraction. Due to usefulness in gas storage, catalysis, anion sensing recognition and drug delivery, cluster complexes are of highest interest these days. By the right choice of ligand polymetallic supermolecules can be synthesized which find their application as single molecular magnetic (SMM). By treatment of dialdehyde with metal perchlorate salts of Ni, Zn, and Co in the presence of strong base NaOH at elevated temperature using methanol as solvent, rare heptametallic clusters were obtained. The synthesis of these disc-shaped heptameric complexes highly depends on the factors including ligand to metal ratios, temperature and the types of base used. These complexes are only obtained in the presence of a strong base like sodium hydroxide. To validate the synthetic approach, we used a weak base such triethylamine which didn't result in the formation of heptamer complexes. The nature of the ligand having unidirectional coordination sides resulted in the unique arrangement of the metal atoms in the heptameric complexes. The X-ray structural analysis revealed that cores of these crystals are hexagonal shape of MII ions which surround the central metal ion bridged by µ3-OH. The peripheral metal atoms are surrounded by six ligand molecules.