packing. Despite this variation, there is still a strong correlation of alkyl chain length with the inter-tape spacing in a single direction in the crystal. This correlation is strongest at ambient temperature where the longer chains are highly disordered and extended. We observe an “odd-number carbon” effect where bis-N-propyl 1b and bis-N-pentyl 1d derivatives undergo a structural phase transition with
双-N-烷基-
氯三嗪显示出形成固态的一维氢键带的强烈趋势。我们预测增加最简单的带形成分子中的烷基链长度将能够控制增加结晶态的带间间距。从双-N-乙基到双-N的一系列双-N-烷基在低温和环境温度下,使用单晶和粉末X射线衍射法合成了戊基戊基并对其结构进行了表征。在低温下,烷基链很少是线性的,而是采用各种构象来实现紧密堆积。尽管有这种变化,但在晶体中,烷基链长与单个方向上的带间间距仍然存在很强的相关性。在较长链高度无序和延伸的环境温度下,这种相关性最强。我们观察到“奇数碳”效应,其中双N-丙基1b和双N-戊基1d衍
生物随温度发生结构相变。