3D, 2D and 1D networks via N-H⋯ O and N-H⋯ N hydrogen bonding by the bis-amide analogues: Effect of chain lengths and odd-even spacers
作者:GARGI MUKHERJEE、KUMAR BIRADHA
DOI:10.1007/s12039-014-0696-7
日期:2014.9
The synthesis, crystal structures and hydrogen bonding networks of four members of the bis(pyridinecarboxamido)alkane and bis(pyridyl)alkanediamides series (1 ≤ n ≤ 8), where the amide moieties are separated by alkyl chain (-(CH2)n-) having even or odd number of -(CH2)-groups are explored and correlated with the previously reported structures. The odd members (n = odd) of both the series are found to adopt three-dimensional networks in contrast to the 1D or 2D structures of the even members (n = even). This odd-even effect on the dimensionality of the networks however disappears with increase in chain length.
本研究探讨了双(吡啶羧酰胺基)烷烷和双(吡啶基)烷二元酰胺系列(1 ≤ n ≤ 8)四个成员的合成、晶体结构和氢键网络,其中酰胺分子被具有偶数或奇数个-(CH2)-基团的烷基链(-(CH2)n-)分隔,并与之前报道的结构进行了关联。发现这两个系列的奇数成员(n = 奇数)采用三维网络结构,而偶数成员(n = 偶数)则采用一维或二维结构。然而,随着链长的增加,网络维度上的这种奇偶效应也随之消失。