Gotoh Kazuma, Ishida Hiroyuki
Department of Chemistry, Faculty of Science, Okayama University, Okayama 700-8530, Japan.
Acta Crystallogr E Crystallogr Commun. 2017 Jul 17;73(Pt 8):1192-1196. doi: 10.1107/S2056989017010167. eCollection 2017 Jul 1.
The crystal structures of two hydrogen-bonded compounds, namely 4-meth-oxy-benzoic acid-1,3-bis-(pyridin-4-yl)propane (2/1), CHN·CHO·CHO, (I), and biphenyl-4,4'-di-carb-oxy-lic acid-4-meth-oxy-pyridine (1/2), CHO·CHNO·CHNO, (II), have been determined at 93 K. In (I), the asymmetric unit consists of two crystallographically independent 4-meth-oxy-benzoic acid mol-ecules and one 1,3-bis-(pyridin-4-yl)propane mol-ecule. The asymmetric unit of (II) comprises one biphenyl-4,4'-di-carb-oxy-lic acid mol-ecule and two independent 4-meth-oxy-pyridine mol-ecules. In each crystal, the acid and base mol-ecules are linked by short O-H⋯N/N-H⋯O hydrogen bonds, in which H atoms are disordered over the acid O-atom and base N-atom sites, forming a linear hydrogen-bonded 2:1 or 1:2 unit of the acid and the base. The 2:1 units of (I) are linked C-H⋯π, π-π and C-H⋯O inter-actions into a tape structure along [101], while the 1:2 units of (II) form a double-chain structure along [-101] through π-π and C-H⋯O inter-actions.
两种氢键化合物，即4-甲氧基苯甲酸-1,3-双（吡啶-4-基）丙烷（2/1），CHN·CHO·CHO，（I）和联苯-4,4'-二羧酸-4-甲氧基吡啶（1/2），CHO·CHNO·CHNO，（II）的晶体结构已在93 K下测定。在（I）中，不对称单元由两个晶体学独立的4-甲氧基苯甲酸分子和一个1,3-双（吡啶-4-基）丙烷分子组成。（II）的不对称单元包括一个联苯-4,4'-二羧酸分子和两个独立的4-甲氧基吡啶分子。在每个晶体中，酸和碱分子通过短的O-H⋯N/N-H⋯O氢键相连，其中H原子在酸的O原子和碱的N原子位置上无序分布，形成酸和碱的线性氢键2:1或1:2单元。（I）的2:1单元通过C-H⋯π、π-π和C-H⋯O相互作用沿[101]连接成带状结构，而（II）的1:2单元通过π-π和C-H⋯O相互作用沿[-101]形成双链结构。
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