Donna Franklin, Aundrea Lee, Frank R Fronczek, Thomas Junk
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引用次数: 0
摘要
[1,4]Ditellurino[2,3-b:5,6-b']di-pyrazine 是首次报道的含有重金 属的 [1,4]chalcogena[2,3-b:5,6-b']di-pyrazine 不对称单元由三个分子组成。C8H4N4Te2 的硫类似物是平面的[Lynch 等人 (1994 ▸) Cryst. Struct.中心环的两个 Te2C2 环之间的二面角为 57.9°（三个的平均值）。C-Te 键长度从 2.1105 (16) Å 到 2.1381 (17) Å 不等，与它们的共价半径预测值十分吻合。所有 Te 原子都参与了分子间 Te⋯N 接触，其距离范围为 2.894 (2) Å 至 2.963 (2) Å。这些接触形成了螺旋状的超分子组装，形成螺旋柱。
[1,4]Ditellurino[2,3-b:5,6-b']di-pyrazine represents the first reported [1,4]chalcogena[2,3-b:5,6-b']di-pyrazine containing a heavy chalcogens The asymmetric unit consists of three mol-ecules. In contrast to its sulfur analog, which is planar [Lynch et al. (1994 ▸) Cryst. Struct. Commun.50,1470-1472], C8H4N4Te2 is folded along the Te⋯Te axis to accommodate the larger chalcogenide atoms. The dihedral angle between the two Te2C2 rings of the central ring is 57.9° (mean of three). C-Te bond lengths range from 2.1105 (16) Å to 2.1381 (17) Å, in good agreement with those predicted by their covalent radii. All Te atoms are involved in inter-molecular Te⋯N contacts, with distances in the range 2.894 (2) to 2.963 (2) Å. These result in a spiral supra-molecular assembly, forming helical columns.
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