Dehydrocoupling Reactions of Borane−Secondary and −Primary Amine Adducts Catalyzed by Group-6 Carbonyl Complexes: Formation of Aminoboranes and Borazines
solution of BH(3).NHR(2) (1a: R = Me, 1b: R = 1/2C(4)H(8), 1c: R = 1/2C(5)H(10), 1f: R = Et) containing a catalytic amount of a group-6 metal carbonyl complex, [M(CO)(6)] (M = Cr, Mo, W), led to dehydrogenative B-N covalent bond formation to produce aminoborane dimers, [BH(2)NR(2)](2) (2a-c, f), in high yield. During these reactions a borane sigma complex, [M(CO)(5)(eta(1)-BH(3).NHR(2))] (3), was detected
Coordination of aminoborane, NH2BH2, dictates selectivity and extent of H2 release in metal-catalysed ammonia borane dehydrogenation
作者:Vincent Pons、R. Tom Baker、Nathaniel K. Szymczak、David J. Heldebrant、John C. Linehan、Myrna H. Matus、Daniel J. Grant、David A. Dixon
DOI:10.1039/b809190k
日期:——
In
situ
11
B NMR monitoring, computational modeling, and external trapping studies show that selectivity and extent of H2 release in metal-catalysed dehydrogenation of ammonia borane, NH3BH3, are determined by coordination of reactive aminoborane, NH2BH2, to the metal center.
原位 11 B NMR 监测、计算建模和外部捕获研究表明,在金属催化的氨硼烷 NH3BH3 脱氢反应中,H2 的选择性和释放程度取决于活性氨基硼烷 NH2BH2 与金属中心的配位。
Thermally Induced Dehydrogenation of Amine–Borane Adducts and Ammonia–Borane by Group 6 Cyclopentadienyl Complexes Having Single and Triple Metal–Metal Bonds
作者:Daniel García‐Vivó、Estefanía Huergo、Miguel A. Ruiz、Raquel Travieso‐Puente
DOI:10.1002/ejic.201300629
日期:2013.10
were, in all cases, borazine, [HNBH]3, and polyborazylene, [NBHx] (x < 1), whereas other minor products were derivedfrom B–N bond-cleavage processes. Over the course of these reactions, complexes 1a–c were transformed into the corresponding mononuclear hydrides [MCpH(CO)3] [M = Cr (2a), Mo (2b), W (2c)], which are supposed to be the catalytically active species in these processes, as also supported by
用催化量 (5 mol-%) 的单键二聚体 [M2Cp2(CO)6] [M = Cr (1a), Mo (1b), W ( 1c);Cp = 环戊二烯基] 在温和的热活化 (333 K) 下导致加合物逐步脱氢,并分别在 12、24 和 >34 小时后实现定量转化。在这些反应的初始阶段(低转化率),主要产物是氨基硼烷(NH2=BH2)的环状和支链低聚物。然而,在更长的反应时间(高转化率)下,在所有情况下,主要产物是环硼氮烷 [HNBH]3 和聚硼氮烷 [NBHx] (x < 1),而其他次要产物来自 B-N 键- 裂解过程。在这些反应过程中,配合物 1a-c 被转化为相应的单核氢化物 [MCpH(CO)3] [M = Cr (2a), Mo (2b), W (2c)],它们被认为是这些过程中的催化活性物质,也得到了二氢化物纯样品 [Mo2Cp2(H)2(μ-Ph2PCH2PPh2)(CO)2]
One-pot synthesis of colloidally robust rhodium(0) nanoparticles and their catalytic activity in the dehydrogenation of ammonia-borane for chemical hydrogen storage
作者:Tuğçe Ayvalı、Mehmet Zahmakıran、Saim Özkar
DOI:10.1039/c0dt01633k
日期:——
These new rhodium(0) nanoparticles show unprecedented catalytic activity, lifetime and reusability as a heterogeneous catalyst in room temperature dehydrogenation of ammonia-borane, which is under significant investigation as a potential hydrogenstorage material.
铑(0)纳米粒子稳定 辛酸叔丁基铵 通过减少 辛酸铑(II) 和 叔丁胺-硼烷甲苯在室温下通过ICP-OES,TEM,HRTEM,STEM,EDX,XRD,XPS,FTIR,UV-vis,11 B,13 C和1 H NMR光谱学和元素分析进行表征。这些新型铑(0)纳米颗粒在室温下脱氢中作为非均相催化剂表现出空前的催化活性,寿命和可重复使用性。氨-硼烷,正在作为潜在的储氢材料进行大量研究。
Catalytic dehydrocoupling of amine-boranes and amines into diaminoboranes: isolation of a Pt(<scp>ii</scp>), Shimoi-type, η<sup>1</sup>-BH complex
作者:Marta Roselló-Merino、Raquel J. Rama、Josefina Díez、Salvador Conejero
DOI:10.1039/c6cc02720b
日期:——
The platinum complex [Pt(ItBu′)(ItBu)][BArF] is a very efficient catalyst in the synthesis of diaminoboranes through dehydrocoupling of amine-boranes and amines.