The X-ray Structures of 2,4-Dibromothiazole and 2,4-Diacetyl-5-bromothiazole

The X-ray Structures of 2,4-Dibromothiazole and 2,4-Diacetyl-5-bromothiazole
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2,4-二溴噻唑和2,4-二乙酰基-5-溴噻唑的X射线结构

DOI:
10.1007/s10870-015-0615-x
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发表时间:
2015
影响因子:
0.8
通讯作者:
Aitken K
Aitken K
中科院分区:
化学4区
文献类型:
--
作者:
Aitken K

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2,4-二溴噻唑[斜方晶系,a = 6.700(10),B = 16.21(3),c = 5.516(8)N,空间群Fmm 2]为无序晶体结构,分子沿Br-C(2)-N-C(2)-Br单元方向随机取向,其余环原子S(3)和C(3)H混合占据。2,4-二乙酰基-5-溴噻唑[三斜晶系,a = 4.040(2),B = 8.254(5),c = 13.208(8)°,α = 96.191(17),β = 93.865(16),γ = 94.067(11)°,空间群P-1]的结构以卤键为主,2,4-二溴噻唑在晶体结构中是无序的,如图所示,其分子随机地以任意方向取向。有证据表明,在2,4-二乙酰基-5-溴噻唑的结构中,Br和C = O之间存在着不寻常的分子内(或许也是分子间)卤素键合。
Abstract2,4-Dibromothiazole [orthorhombic, a = 6.700 (10), b = 16.21 (3), c = 5.516 (8) Å, space group Fmm2] shows a disordered crystal structure with molecules randomly oriented with respect to the direction of the Br–C(2)–N–C(2)–Br unit and the remaining ring atoms S(3) and C(3)H showing mixed occupancy. 2,4-Diacetyl-5-bromothiazole [triclinic, a = 4.040 (2), b = 8.254 (5), c = 13.208 (8) Å, α = 96.191 (17), β = 93.865 (16), γ = 94.067 (11)°, space group P-1] shows a structure dominated by halogen bonding, intramolecular between 4-COMe and 5-Br and intermolecular between 2-COMe of one molecule and 5-Br of the next.Graphical Abstract2,4-Dibromothiazole is disordered in the crystal structure with molecules randomly oriented either way round as shown. There is evidence for unusual intramolecular, and perhaps also intermolecular, halogen bonding between Br and C = O in the structure of 2,4-diacetyl-5-bromothiazole.
DOI: 10.1073/pnas.0407607101
发表时间: 2004-11-30
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