Abstract A Cu(II) complex [Cu 2 (phen) 2 (NAB) 2 (HO)] n (phen = 1, 10-phenanthroline and NABH = p -N, N-(2-hydroxyethyl)amino benzoic acid) was synthesized, and its structure was confirmed by X-ray diffraction. The structure of the complex appeared to be clamp-like, in which Cu(II) atoms adopt distorted square pyramidal geometry. Each Cu(II) is coordinated by two nitrogen atoms in phen ligand and two carboxyl oxygen atoms from each of the two NABH ligands. The clamp-like coordination units are bridged by adjacent hydroxyethyl groups into infinite 1D chain, which are further linked by extensive O···H hydrogen bonds and π–π interactions to form 3D networks. The titled complex displayed weak double-stranded DNA interaction activity. Spectroscopic and theoretical simulation results indicated that the complex attached onto DNA surface through hydrogen bonding with base pairs. Graphic abstract A novel benzoic acid derivative with two extremity hydroxyethyl groups was designed and used as auxiliary ligand to synthesize mixed coordinating clamp-like Cu(II)-phenanthroline complex. Hydrogen bonding played crucial role in bridging the clamps into infinite 1D chain and also the DNA complex interaction mode.

中文翻译：

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深入了解 DNA 与无限钳状铜 (II) 复合物之间的相互作用

摘要 Cu(II) 配合物 [Cu 2 (phen) 2 (NAB) 2 (HO)] n (phen = 1, 10-菲咯啉和 NABH = p -N, N-(2-羟乙基)氨基苯甲酸)是合成，并通过X射线衍射证实了其结构。该配合物的结构似乎是钳状的，其中 Cu(II) 原子采用扭曲的方形金字塔几何形状。每个 Cu(II) 由 phen 配体中的两个氮原子和来自两个 NABH 配体中每一个的两个羧基氧原子配位。钳状配位单元由相邻的羟乙基桥接成无限的一维链，通过广泛的O…H氢键和π-π相互作用进一步连接形成3D网络。标题复合物显示出较弱的双链 DNA 相互作用活性。光谱和理论模拟结果表明，复合物通过与碱基对的氢键连接到 DNA 表面。图形摘要 设计了一种具有两个末端羟乙基的新型苯甲酸衍生物，并将其用作辅助配体，合成了混合配位钳状 Cu(II)-菲咯啉配合物。氢键在将夹子连接成无限的一维链以及 DNA 复杂的相互作用模式方面起着至关重要的作用。