presented for cyclization to yield 2-bora-1,3-diazacycloalkanium cations in the gasphase. While the neutral compounds in solution and solid phase are known to possess an acyclicstructure (as revealed by X-ray diffraction), the gaseous cations (from which borohydride BH4– ion has been expelled) have a cyclicstructure, as revealed by InfraRed Multiple Photon Dissociation (IRMPD) spectroscopy and collisionally
Open-Flask Synthesis of Amine–Boranes via Tandem Amine–Ammonium Salt Equilibration–Metathesis
作者:P. Veeraraghavan Ramachandran、Ameya S. Kulkarni
DOI:10.1021/acs.inorgchem.5b00572
日期:2015.6.15
An amine–ammonium salt equilibration–metathesis sequence provides high-purity amine–boranes in excellent yields from sodium borohydride in refluxing reagent-grade tetrahydrofuran in an open flask.
Amine-Boranes: Green Hypergolic Fuels with Consistently Low Ignition Delays
作者:P. Veeraraghavan Ramachandran、Ameya S. Kulkarni、Mark A. Pfeil、Jacob D. Dennis、Jared D. Willits、Stephen D. Heister、Steven F. Son、Timothée L. Pourpoint
DOI:10.1002/chem.201405224
日期:2014.12.15
them to hypergols or decreases their ignitiondelays (IDs) multifold (with white fuming nitric acid as the oxidant). With consistentlylow IDs, amine–boranes represent a class of compounds that can be promising alternatives to toxic hydrazine and its derivatives as propellants. A structure–hypergolicity relationship study reveals the necessary features for the low ID.
Procedures for the Synthesis of Ethylenediamine Bisborane and Ammonia Borane
申请人:Ramachandran Padi Veeraraghavan
公开号:US20130225863A1
公开(公告)日:2013-08-29
A method for synthesizing ammonia borane includes (a) preparing a reaction mixture in one or more solvents, the reaction mixture containing sodium borohydride, at least one ammonium salt, and ammonia; and (b) incubating the reaction mixture at temperatures between about 0° C. to about room temperature in an ambient air environment under conditions sufficient to form ammonia borane. Methods for synthesizing ethylenediamine bisborane, and methods for dehydrogenation of ethylenediamine bisborane are also described.
Complexation of Ammonia Boranes with Al<sup>3+</sup>
作者:Iurii Dovgaliuk、Kasper T. Møller、Koen Robeyns、Véronique Louppe、Torben R. Jensen、Yaroslav Filinchuk
DOI:10.1021/acs.inorgchem.8b02630
日期:2019.4.15
Ammonia borane, NH3BH3 (AB), is very attractive for hydrogen storage; however, it dehydrogenates exothermally, producing a mixture of polymeric products with limited potential for direct rehydrogenation. Recently, it was shown that AB complexed with Al3+ in Al(BH4)3·AB endothermically dehydrogenates to a single product identified as Al(BH4)3·NHBH, with the potential for direct rehydrogenation of AB