本論文描述含雙吡啶化合物的鹽類，包括[(4,4'-bpy)CH2 (1,4-C6H4)CH2(4,4'-bpy)](X)2 (X = PF6, 2a-2PF6; X = Br, 2a-2Br) 和[(4,4’-bpy)CH2(1,3-C6H4)CH2(4,4'-bpy)](PF6)2 (4-2PF6)的構造，[(4,4'- dimethylenebpy)CH2(1,4-C6H4)CH2(4,4'-dimethy lenebpy)](PF6)2(2b-2PF6),[(4,4'-trimethylenebpy)CH2(1,4-C6H4)CH2(4,4’-trimethylenebpy)](Br)2(2c-2Br) 和[(4,4'-bpy)CH2Ph](PF6) (6-PF6)的合成，以及鹽類2c2+和6+的構造。可歸納成下列會影響雙吡啶(4,4'-pyridylpyridinium,下圖)鹽類陽離子幾何構型晶體堆疊因素:
1)雙吡啶陽離子具有gauch及anti兩種幾何構型的異構物，藉由更替適當的陰離子可以分別得到相對應的幾何構型晶體結構。當陰離子為Br-時， 2a2+和2c2+採用anti幾何構型堆疊；而陰離子為PF6-時，2a2+ 和42+ 的採用gauche幾何構型堆疊。
2)當陰離子為單原子中心(Br-)時，藉[C－H…Br]氫鍵使雙吡啶陽離子採鯡魚骨形或雙鯡魚骨形的排列；陰離子為多原子中心(PF6-)時，藉[C－H…F]氫鍵使雙吡啶陽離子採較複雜的排列。

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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