作者:Sergiy V. Rosokha、Charlotte L. Stern、Alan Swartz、Rory Stewart
DOI:10.1039/c4cp00976b
日期:——
associates between bromocarbons and polydentate pseudohalide anions. Specifically, in the (Pr4N)NCO·CBr4, (Pr4N)N3·CBr4 and (Pr4N)NCO·CBr3NO2 co-crystals, bromine substituents of the electrophiles are halogen-bonded with the (CN or NN) π-bonds of the cyanate or azide anions. Co-crystals of CBr4 with (Pr4N)NCS show two modes (C–Br⋯S–C and C–Br⋯NC) of halogen bonding, while tribromoacetamide molecules form C–Br⋯S–C
紫外可见测量表明,拟卤化物阴离子的相互作用,A -(A - = N 3 -,NCO -,NCS - )中,用亲电bromocarbons,R-溴(R-BR = CBR 4,CBR 3 NO 2,CBR 3 CONH 2,CBR 3 H,CBR 3楼CBR 3 CN或C 3溴2 ˚F 6),在溶液中导致形成[R-BR,A的-]复合体。这些缔合体的特征是在200-350 nm范围内有很强的吸收带,显示出与相互作用的阴离子和R-Br亲电试剂的前沿(HOMO-LUMO)轨道的分离具有明显的Mulliken相关性。X射线晶体学研究确定了溴碳与多齿假卤化物阴离子之间的卤素键联缔合物的主要结构特征。具体地,在(Pr 4 N)NCO·CBr 4,(Pr 4 N)N 3 ·CBr 4和(Pr 4 N)NCO·CBr 3 NO 2共晶体中,亲电子体的溴取代基与卤素键合。 (C N或NN)氰酸根或叠氮化物阴离子的π键。CBr