Developing a cognitive model of solid geometry based on Interpretive Structural Modeling method.

With the advancement of science and artificial intelligence, education is experiencing significant innovation. The adaptive learning system is emerging as a promising approach to achieving personalized learning. The cognitive model plays a crucial role as the fundamental rationale behind the adaptive learning system.

Syntheses, Structures, and Reactivities of N-Heterocyclic Carbene-Coordinated Aminoborane Complexes.

Recent research has attracted considerable attention toward N-heterocyclic carbene-coordinated boranes (NHC-borane) and their B-substituted derivatives because of their unique characteristics. In the present work, we focused on the syntheses, structures, and reactivities of such types of amine complexes, [NHC·BHNH]X ((NHC = IPr (1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) and IMe (1,3-dimethylimidazol-2-ylidene); X = Cl, I, OTf). We have developed a synthetic method to access NHC·BHNH through the reaction of NaH with [IPr·BHNH]I, which was synthesized by the reaction of IPr·BHI with NH.

A general method for the synthesis of covalent and ionic amine borane complexes containing trinitromethyl fragments.

A general approach for the synthesis of covalent and ionic amine borane complexes containing trinitromethyl fragments has been developed through metathesis reactions between amine chloroborane complexes and potassium salt of trinitromethyl (K[C(NO)]). Five covalent and ionic trinitromethyl amine borane complexes have been synthesized in good yields with high purity and it is found that the ionic complex, [HB(NH)][C(NO)], might be a promising energetic material on the basis of the investigation of its thermal decomposition behaviour.

Facile Synthetic Method of Na[BH(NHBH)H] Based on the Reactions of Sodium Amidoborane (NaNHBH) with NiBr or CoCl.

The reactions of sodium amidoborane (NaNHBH) with NiBr have been investigated, and the results showed that black precipitate including the NiBNH composites could be obtained. From the aqueous solution of the precipitate , the hydrolysis product Ni-B () was isolated and characterized. Both the in situ formed precipitate and the hydrolysis product can catalyze the formation of Na[BH(NHBH)H].

Hydroboration Reaction and Mechanism of Carboxylic Acids using NaNH(BH), a Hydroboration Reagent with Reducing Capability between NaBH and LiAlH.

Hydroboration reactions of carboxylic acids using sodium aminodiboranate (NaNH[BH], NaADBH) to form primary alcohols were systematically investigated, and the reduction mechanism was elucidated experimentally and computationally. The transfer of hydride ions from B atoms to C atoms, the key step in the mechanism, was theoretically illustrated and supported by experimental results. The intermediates of NHBH, PhCH═CHCOOBHNHBH, PhCH═CHCHOBO, and the byproducts of BH, NHBH, and NHBH were identified and characterized by B and H NMR.

Facile cyclization of sodium aminodiboranate to construct a boron-nitrogen-hydrogen ring.

A facile and efficient cyclization of sodium aminodiboranate to construct a boron-nitrogen-hydrogen ring is presented. This new strategy can be developed into a general method to prepare aminodiborane and its derivatives. Theoretical calculations show that a one-step cyclization mechanism is favored, where the dihydrogen bond plays an important role.