Efficient methods for the preparation of bromine-containing exo-nido- and closo-ruthenacarborane clusters
作者:D. I. D’yachihin、I. D. Grishin、A. V. Piskunov、I. A. Godovikov、A. Yu. Kostukovich、A. F. Smol’yakov、F. M. Dolgushin、I. T. Chizhevsky、D. F. Grishin
DOI:10.1007/s11172-014-0742-0
日期:2014.10
An efficient method for the synthesis of bromine-containing exo-nido-clusters of a general formula exo-5,6,10-[Br(Ph3P)2Ru]-5,6,10-(μ-H)3-10-H-7,8-R2-nido-7,8-C2B9H6 (R = H, Me) was developed using the reactions of RuBr2(PPh3)3 with [K][7,8-R2-7,8-nido-C2B9H10]. Replacement of the phosphine ligands in the starting exo-nido-cluster (R = H) with the diphosphine ones afforded a series of diamagnetic (18-electron) closo-bromoruthenacarboranes, 3-Br-3,3-[κ2-Ph2P(CH2) n PPh2]-3-H-closo-3,1,2-RuC2B9H11 (n = 3−5). A mild thermal method of the halide ligands exchange (Cl → Br) upon heating of diamagnetic chlorine-containing complexes 3,3-[κ2-Ph2P(CH2) n PPh2]-3-H-3-Cl-closo-3,1,2-RuC2B9H11 (n = 3−5) with excess of CBr4 in benzene (70–80 °C) was suggested for the synthesis of paramagnetic (17-electron) bromine-containing ruthenacarboranes, 3-Br-3,3-[κ2-Ph2P(CH2) n PPh2]-closo-3,1,2-RuC2B9H11 (n = 3, 4) or 3-Br-3,3,8-[κ2-Ph2(CH2)5PPh]-μ- . Paramagnetic chlorine-containing clusters 3-Cl-3,3-[κ2-Ph2P(CH2) n PPh2]-closo-3,1,2-RuC2B9H11 (n = 2−4) were alternatively used as the starting compounds in the exchange reaction. Complexes with dppp and dppb (dppp is 1,3-bis(diphenylphosphino)propane, dppb is 1,4-bis(diphenylphosphino)butane) were used as examples to study the thermal reactions (toluene, 110 °C) leading in the presence of CBr4 to paramagnetic mono(P-o-phenylene)- and bis(P,P-o-phenylene)cycloboronated clusters, 3-Br-3,3,8-[κ2-Ph2(CH2) n PPh]-μ- and 3-Br-3,3,4,8-[κ2-Ph2(CH2) n P]-μ- (n = 3, 4). The compounds obtained were characterized by NMR spectroscopy (in the case of diamagnetic complexes), ESR spectroscopy and mass spectrometry (in the case of paramagnetic compounds). X-ray diffraction experiments were carried out for two cycloboronated paramagnetic complexes.
一种有效合成通式为 exo-5,6,10-[Br(Ph3P)2Ru]-5,6,10-(μ-H)3-10- 的含
溴 exo-nido-簇的方法H-7,8-R2-nido-7,8-C2
B9H6 (R = H, Me) 通过 RuBr2(PPh3)3 与 [K][7,8-R2-7,8-nido- 的反
应得到C2
B9H10]。用二
膦配体取代起始的外-硝基团簇 (R = H) 中的
膦配体,得到一系列抗磁性(18 个电子)的 closo-bromoruthenacarboranes,3-Br-3,3-[κ
2-Ph2P(
CH2) ) n PPh2]-3-H-closo-3,1,2-RuC2
B9H11 (n = 3−5)。抗磁性含
氯配合物 3,3-[κ
2-Ph2P( ) n PPh2]-3-
H-3-Cl-closo-3,1 加热时卤化物
配体交换 (Cl → Br) 的温和热法建议将 ,2-RuC2
B9H11 (n = 3−5) 与过量的
CBr4 在
苯中 (70–80 °C) 合成顺磁性(17 个电子)含
溴钌碳硼烷,3-Br-3,3-[ κ
2-Ph2P( ) n PPh2]-closo-3,1,2-RuC2
B9H11 (n = 3, 4) 或 3-Br-3,3,8-[κ
2-Ph2( )5PPh]-μ- 。顺磁含
氯簇 3-Cl-3,3-[κ
2-Ph2P( ) n PPh2]-closo-3,1,2-RuC2
B9H11 (n = 2−4) 也可用作交换中的起始化合物反应。以 dppp 和 dppb 的配合物(dppp 是
1,3-双(
二苯基膦)
丙烷,dppb 是 1,4-双(
二苯基膦)
丁烷)为例,研究了存在下导致的热反应(
甲苯,110 °C) 形成顺磁性单(P-邻亚
苯基)-和双(P,P-邻-亚
苯基)环
硼化簇,3-Br-3,3,8-[κ
2-Ph2( ) n PPh]-μ- 和 3-Br -3,3,4,8-[κ
2-Ph2( ) n P]-μ- (n = 3, 4)。所获得的化合物通过NMR光谱(在抗磁性络合物的情况下)、ESR光谱和质谱(在顺磁性化合物的情况下)进行表征。对两种环
硼化顺磁配合物进行了X射线衍射实验。