Xu Zhan Lin, Ma Xiao Yuan, Ma Shuai, Wang Xiu Yan
College of Chemistry, Jilin Normal University, Siping 136000, People's Republic of China.
Acta Crystallogr C. 2010 Sep;66(Pt 9):m245-8. doi: 10.1107/S0108270110032026. Epub 2010 Aug 18.
The asymmetric unit of the title compound, Pb(2)(C(8)H(4)O(4))(2)(C(18)H(11)N(5))(2), contains two Pb(II) atoms, two benzene-1,4-dicarboxylate (1,4-bdc) dianions and two 6-(4-pyridyl)-5H-imidazolo[4,5-f][1,10]phenanthroline (L) ligands. Each Pb(II) atom is eight-coordinated by three N atoms from two different L ligands and five carboxylate O atoms from three different 1,4-bdc dianions. The two 1,4-bdc dianions (1,4-bdc(1) and 1,4-bdc(2)) show different coordination modes. Each 1,4-bdc(1) coordinates to two Pb(II) atoms in a chelating bis-bidentate mode. Each carboxylate group of the 1,4-bdc(2) anion connects two Pb(II) atoms in a chelating-bridging tridentate mode to form a dinuclear unit. Neighbouring dinuclear units are connected together by the aromatic backbone of the 1,4-bdc dianions and the L ligands into a three-dimensional six-connected alpha-polonium framework. The most striking feature is that two identical three-dimensional single alpha-polonium nets are interlocked with each other, thus leading directly to the formation of a twofold interpenetrated three-dimensional alpha-polonium architecture. The framework is held together in part by strong N-H...O hydrogen bonds between the imidazole NH groups of the L ligands and the carboxylate O atoms of 1,4-bdc dianions within different alpha-polonium nets.
标题化合物[Pb₂(C₈H₄O₄)₂(C₁₈H₁₁N₅)₂]ₙ的不对称单元包含两个Pb(II)原子、两个苯-1,4-二甲酸根(1,4-bdc)二价阴离子和两个6-(4-吡啶基)-5H-咪唑并[4,5-f][1,10]菲咯啉(L)配体。每个Pb(II)原子由来自两个不同L配体的三个N原子和来自三个不同1,4-bdc二价阴离子的五个羧酸根O原子八配位。两个1,4-bdc二价阴离子(1,4-bdc(1)和1,4-bdc(2))呈现不同的配位模式。每个1,4-bdc(1)以螯合双齿模式与两个Pb(II)原子配位。1,4-bdc(2)阴离子的每个羧酸根基团以螯合-桥连三齿模式连接两个Pb(II)原子，形成一个双核单元。相邻的双核单元通过1,4-bdc二价阴离子的芳香骨架和L配体连接在一起，形成一个三维六连接的α-钋骨架。最显著的特征是两个相同的三维单一α-钋网相互联锁，从而直接导致形成一个二重互穿的三维α-钋结构。该骨架部分地通过不同α-钋网内L配体的咪唑NH基团与1,4-bdc二价阴离子的羧酸根O原子之间的强N-H...O氢键维系在一起。
