The present invention relates to a catalyst precursor for forming a molybdenum disulfide catalyst through a reaction with sulfur in heavy oil and to a method for hydrocracking heavy oil by using same. According to the present invention, the yield of a low-boiling liquid product with a high economic value in the products by heavy oil cracking can be increased, and the yield of a relatively uneconomical gas product or coke (toluene insoluble component), which is a byproduct, can be significantly lowered.

The present disclosure relates to improved processes for the preparation of metal hydrides. The present disclosure also relates to metal hydrides, e.g., metal hydrides prepared by the processes described herein, that exhibit enhanced hydrogen storage capacity when used as hydrogen storage systems.

The present disclosure relates to improved processes for the preparation of metal hydrides. The present disclosure also relates to metal hydrides, e.g., metal hydrides prepared by the processes described herein, that exhibit enhanced hydrogen storage capacity when used as hydrogen storage systems.

The present invention relates to a novel ligand compound, a transition metal compound and a catalyst composition comprising the same. The novel ligand compound and the transition metal compound of the present invention may be useful as a catalyst of polymerization reaction for preparing an olefin-based polymer having a low density.

The present invention relates to a dinuclear molybdenum complex with ligands selected from fatty tertiary amines of formula (I):
R—N[(CH.sub.2).sub.nR.sup.2][(CH.sub.2).sub.nR.sup.3]  (I)
wherein R represents a linear or branched alkyl comprising 3 to 30 carbon atoms, preferably 3 to 20, advantageously 7 to 17 carbon atoms; n, identical or different, represents 2 or 3; R.sup.2 and R.sup.3, identical or different, represent an O, OR, NR′.sub.2, COOR′, or COO group, where R′, identical or different, represents a hydrogen atom or an alkaline or alkaline earth metal, preferably R′ is H, preferably R.sup.2 and R.sup.3, identical or different, represent an OH or NH.sub.2 group.

The present invention relates to a dinuclear molybdenum complex with ligands selected from fatty tertiary amines of formula (I):
R—N[(CH.sub.2).sub.nR.sup.2][(CH.sub.2).sub.nR.sup.3]  (I)
wherein R represents a linear or branched alkyl comprising 3 to 30 carbon atoms, preferably 3 to 20, advantageously 7 to 17 carbon atoms; n, identical or different, represents 2 or 3; R.sup.2 and R.sup.3, identical or different, represent an O, OR, NR′.sub.2, COOR′, or COO group, where R′, identical or different, represents a hydrogen atom or an alkaline or alkaline earth metal, preferably R′ is H, preferably R.sup.2 and R.sup.3, identical or different, represent an OH or NH.sub.2 group.

Provided herein are trans-cyclic polyacetylenes and methods of preparing the trans-cyclic polyacetylenes.

The present disclosure provides a polyoxomolybdate material and a preparation method and use thereof, a solar cell, and an organic light-emitting diode (OLED), and belongs to the technical field of optoelectronic devices. An organic solar cell (OSC) with the polyoxomolybdate material of the present disclosure as an electrode interface material has an open-circuit voltage of 0.810 V to 0.860 V, a short-circuit current density of 24.50 mA/cm.sup.2 to 26.10 mA/cm.sup.2, a fill factor of 68.7% to 78.8%, and a power conversion efficiency (PCE) of 14.21% to 17.42%. An OLED with the polyoxomolybdate material of the present disclosure has a turn-on voltage of 2.3 V to 3.5 V, a maximum brightness of 14,330 cd/m.sup.2 to 43,430 cd/m.sup.2, a current efficiency of 7.00 cd/A to 15.00 cd/A, and a power efficiency of 3.50 lm/W to 13.00 lm/W, and exhibits prominent LED performance.

The present disclosure provides a polyoxomolybdate material and a preparation method and use thereof, a solar cell, and an organic light-emitting diode (OLED), and belongs to the technical field of optoelectronic devices. An organic solar cell (OSC) with the polyoxomolybdate material of the present disclosure as an electrode interface material has an open-circuit voltage of 0.810 V to 0.860 V, a short-circuit current density of 24.50 mA/cm.sup.2 to 26.10 mA/cm.sup.2, a fill factor of 68.7% to 78.8%, and a power conversion efficiency (PCE) of 14.21% to 17.42%. An OLED with the polyoxomolybdate material of the present disclosure has a turn-on voltage of 2.3 V to 3.5 V, a maximum brightness of 14,330 cd/m.sup.2 to 43,430 cd/m.sup.2, a current efficiency of 7.00 cd/A to 15.00 cd/A, and a power efficiency of 3.50 lm/W to 13.00 lm/W, and exhibits prominent LED performance.

A light-emitting device includes: a first electrode; a second electrode facing the first electrode; and an interlayer between the first electrode and the second electrode and including an emission layer, wherein the interlayer includes a heterocyclic compound of Formula 1:

A.sub.1B.sub.1].sub.n1  Formula 1

wherein, in Formula 1, the variables are defined herein.