Monohalogenated ferrocenes C(5)H(5)FeC(5)H(4)X (X = Cl, Br and I) and a second polymorph of C(5)H(5)FeC(5)H(4)I.

Monohalogenated ferrocenes C(5)H(5)FeC(5)H(4)X (X = Cl, Br and I) and a second polymorph of C(5)H(5)FeC(5)H(4)I.
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单卤代二茂铁 C(5)H(5)FeC(5)H(4)X(X = Cl、Br 和 I)和 C(5)H(5)FeC(5)H(4)I 的第二种多晶型物

DOI:
10.1107/s0108270109034763
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发表时间:
2009
期刊:
Acta crystallographica. Section C, Crystal structure communications
影响因子:
--
通讯作者:
Timofeeva,TatianaV
Timofeeva,TatianaV
中科院分区:
--
文献类型:
--
作者:
Romanov,AlexanderS;Mulroy,JosephM;Khrustalev,VictorN;Antipin,MikhailYu;Timofeeva,TatianaV

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三种标题单取代二茂铁,即 1-氯二茂铁,[Fe(C5H5)(C5H4Cl)],(I),1-溴二茂铁,[Fe(C5H5)(C5H4Br)],(II),和 1-碘二茂铁,[Fe(C5H5)(C5H4I)],(III),在100 K。氯代二茂铁和溴代二茂铁是同晶型晶体。碘二茂铁 (III) 的新三斜多晶型物 [空间群 P\overline{1}, Z = 4, T = 100 K, V = 943.8 (4) Å3],以及先前报道的 (III) 单斜晶型物 [Laus, Wurst & Schottenberger (2005)。 Z.克里斯塔洛格。新水晶。结构。 220、229–230;空间群Pc,Z = 4,T = 100 K,V = 924.9 Å3]分别通过乙醇溶液在253和303 K下结晶获得。所有四个相在晶胞中都包含两个独立的分子。环戊二烯基 (Cp) 环的相对方向在 (I) 和 (II) 的独立分子中重叠且交错,而 (III) 仅表现出重叠构象。 (III) 的三斜晶型和单斜晶型多晶型物含有非键合分子间 I⋯I 接触,导致不同的堆积模式。在(III)的三斜晶型中,分子以锯齿形四聚体排列,而在单斜晶型中,分子沿a轴排列成锯齿形链。 (III) 的晶体学数据以及计算的两种多晶型物的晶格能量表明单斜晶型更稳定。
The structures of the three title monosubstituted ferrocenes, namely 1-chloroferrocene, [Fe(C5H5)(C5H4Cl)], (I), 1-bromoferrocene, [Fe(C5H5)(C5H4Br)], (II), and 1-iodoferrocene, [Fe(C5H5)(C5H4I)], (III), were determined at 100 K. The chloro- and bromoferrocenes are isomorphous crystals. The new triclinic polymorph [space group P\overline{1}, Z = 4, T = 100 K, V = 943.8 (4) Å3] of iodoferrocene, (III), and the previously reported monoclinic polymorph of (III) [Laus, Wurst & Schottenberger (2005). Z. Kristallogr. New Cryst. Struct. 220, 229–230; space group Pc, Z = 4, T = 100 K, V = 924.9 Å3] were obtained by crystallization from ethanolic solutions at 253 and 303 K, respectively. All four phases contain two independent molecules in the unit cell. The relative orientations of the cyclopentadienyl (Cp) rings are eclipsed and staggered in the independent molecules of (I) and (II), while (III) demonstrates only an eclipsed conformation. The triclinic and monoclinic polymorphs of (III) contain nonbonded intermolecular I⋯I contacts, causing different packing modes. In the triclinic form of (III), the molecules are arranged in zigzag tetramers, while in the monoclinic form the molecules are arranged in zigzag chains along the a axis. Crystallographic data for (III), along with the computed lattice energies of the two polymorphs, suggest that the monoclinic form is more stable.
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