Structural diversity in the self-assembly of Ag(I) complexes containing 2-amino-5-halopyrimidine |
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Authors: | Chia-Jun WuChih-Yuan Lin Pei-Chi ChengChun-Wei Yeh Jhy-Der Chen Ju-Chun Wang |
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Affiliation: | a Department of Chemistry, Chung-Yuan Christian University, Chung-Li, Taiwan, ROC b Department of Chemistry, Soochow University, Taipei, Taiwan, ROC |
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Abstract: | A series of Ag(I) complexes containing the 2-amino-5-halopyrimidine ligands have been synthesized and their structures characterized by X-ray crystallography. The isomorphous complexes Ag(L-Cl)2(CF3SO3) (L-Cl = 2-amino-5-chloropyrimidine), 1, and Ag(L-Br)2(CF3SO3) (L-Br = 2-amino-5-bromopyrimidine), 2, are mononuclear, while [Ag(L-Br)(CF3SO3)]6·6C4H10O, 3, and [Ag(L-I)(CF3SO3)]6 (L-I = 2-amino-5-iodopyrimidine), 4, show cyclic self-assembly of six Ag(Ι) atoms and six L-X ligands, resulting in 24-membered metallocycles. The complex [Ag(L-I)(CF3SO3)]∞, 5, forms 1D zigzag chains which are linked through C-I?Ag and Ag?O interactions to form a 3D structure. The tetranuclear complexes [Ag(L-X)(NO3)]4 [X = Cl, 6; Br, 7] form 16-membered metallocycles, while [Ag(L-X)(ClO4)]∞ [X = Cl, 8; Br, 9] exhibit helical chains. The different structure of 5 from 1 and 2 appears to be due to the stronger nucleophilic character of the iodine atom. In these complexes, the relatively smaller NO3− anions lead to the formation of tetranuclear metallocycles and the larger CF3SO3− anions support the hexanuclear metallocycles, whereas the ClO4− anions induce the helical chains. |
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Keywords: | 2-Amino-5-chloropyrimidine 2-Amino-5-bromopyrimidine 2-Amino-5-iodopyrimidine Self-assembly |
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