| Summary: | 碩士 === 國立成功大學 === 化學系碩博士班 === 94 === Five structures of 4,4'-pyridylpyridinium (4,4'-bpy)-containing salts, [(4,4'-bpy)CH2(1,4-C6H4)CH2(4,4'-bpy)](X)2 (X = PF6, 2a- 2PF6; X = Br, 2a-2Br), [(4,4’-trimethylenebpy)CH2(1,4-C6H4)CH2 (4,4'-trimethylenebpy)](Br)2 (2c-2Br)[(4,4'-bpy)CH2(1,3-C6H4)CH2 (4,4'-bpy)] (PF6)2 (4-2PF6), , and [(4,4'-bpy) CH2Ph](PF6) (6-PF6), were determined and compared with relevant complexes to reveal:
1)The type of the conformational isomer, in either anti- or gauche-form, can be induced by employing a suitable anion; a bomide anion causes formation of the anti-form whereas a hexafluorophosphate anin causes formation of the gauche-form.By adjusting the counterbalanced anions (Br-and PF6-), anti- and gauche -form geometry supramolecular assembelies can be observed, respectively.
2)The hydrogen bonding interactions between one-atom center,Br-, and aryl hydrogen atoms appear to render the chain-like cations to pack in either a herringbone or double herringbone arrangement, while the[C－H…F] interactions between the multiatom center,PF6-, and aryl hydrogen atoms, produce a complicated packing.
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