Thermal Decomposition and Hypergolic Reaction of a Dicyanoborohydride Ionic Liquid.

In this study, in situ infrared spectroscopy techniques and thermogravimetric analysis coupled with mass spectrometry (TGA-MS) are employed to characterize the reactivity of the ionic liquid, 1-butyl-3-methylimidazolium dicyanoborohydride (BMIMDCBH), in comparison to the well-characterized 1-butyl-3-methylimidazolium dicyanamide (BMIMDCA) ionic liquid. TGA measurements determined the enthalpy of vaporization (Δ) to be 112.7 ± 12.

Hydroxytricyanoborate Anion: Synthetic Aspects and Structural, Chemical, and Spectroscopic Properties.

In recent years, salts of the hydridotricyanoborate anion [BH(CN)] () have become readily available. In spite of the unusually high stability of the anion, it can be used as a valuable starting material for the preparation of selected tricyanoborates, for example, the boron-centered nucleophile B(CN). A further unprecedented example is the hydroxytricyanoborate anion [B(OH)(CN)] that is accessible by oxidation of (HO) with elemental bromine in water.

N-Heterocyclic Olefins as Electron Donors in Combination with Triarylborane Acceptors: Synthesis, Optical and Electronic Properties of D-π-A Compounds.

N-heterocyclic olefins (NHOs), relatives of N-heterocyclic carbenes (NHCs), exhibit high nucleophilicity and soft Lewis basic character. To investigate their π-electron donating ability, NHOs were attached to triarylborane π-acceptors (A) giving donor (D)-π-A compounds 1-3. In addition, an enamine π-donor analogue (4) was synthesized for comparison.

Bis(amidinato)- and bis(guanidinato)silylenes and silylenes with one sterically demanding amidinato or guanidinato ligand: synthesis and reactivity.

This article deals with the synthesis and reactivity of the bis(amidinato)silylene [iPrNC(Ph)NiPr]Si (5), the bis(guanidinato)silylene [iPrNC(NiPr)NiPr]Si (6), the mono(amidinato)silylene [DippNC(Ph)NDipp]SiNMe (Dipp = 2,6-diisopropylphenyl) (8) and the mono(guanidinato)silylene [DippNC(NMe)NDipp]SiN(SiMe) (9). The reactions studied include (i) nucleophilic substitutions, (ii) Lewis acid/base reactions, (iii) Brønsted acid/base reactions, (iv) oxidative additions (bond activations, small-molecule activations), (v) cycloaddition reactions with unsaturated organic substrates, (vi) reductions and (vii) radical formation by muonium addition. Silylenes 5, 6, 8 and 9 have been demonstrated to display unique reactivity profiles and to be versatile precursors for the synthesis of novel four- or five-coordinate silicon(ii) and four-, five- or six-coordinate silicon(iv) complexes with unprecedented structural motifs.

Anhydrous, Homoleptic Lanthanide Frameworks with the Pentafluoroethyltricyanoborate Anion.

Pentafluoroethyltricyanoborate frameworks of rare-earth metal ions of the general formula [Ln{CFB(CN)}(OH)] (Ln = La, Eu, Ho; n = 0, 3; [Ln1(OH)]) were synthesized using the oxonium salt (HO)[CFB(CN)] ((HO)1) and lanthanide chlorides LnCl·nHO as starting compounds. Single-crystals of [La{CFB(CN)}] ([La1]) are obtained from the room temperature ionic liquid (RTIL) [EMIm]1 using either a ionothermal approach or by recrystallization of anhydrous microcrystalline [La1] that is obtained from reactions in aqueous media after drying in a vacuum. Removal of water from [Ln1(OH)] (Ln = Eu, Ho) to give microcrystalline [Ln1] is achieved in a vacuum at elevated temperatures.