A method of making an osmium(II) complex having Formula I, L.sup.1-Os-L.sup.2, wherein L.sup.1 and L.sup.2 are independently a biscarbene tridentate ligand, wherein L.sup.1 and L.sup.2 can be same or different is disclosed. The method includes (a) reacting a precursor of ligand L.sup.1 with an osmium precursor to form an intermediate product, wherein the osmium precursor having the formula OsH.sub.x(PR.sub.3).sub.y, wherein x is an integer from 2 to 6 and y is an integer from 2 to 5, and R is selected from the group consisting of aryl, alkyl and cycloalkyl; and (b) reacting a precursor of ligand L.sup.2 with said intermediate product.

Bis(tridentate) osmium(II) complexes containing phosphite groups useful as phosphorescent emitters are disclosed. The disclosed osmium(II) complexes have higher oxidation potential then previously known osmium(II) complexes. An organic light emitting device having an organic layer that includes the disclosed osmium(II) complex is also disclosed.

A compound comprising a first ligand L.sup.A of Formula I: ##STR00001##
is described. In Formula I, Z is selected from O, S, and Se; at least one of X.sup.1, X.sup.2, X.sup.3, and X.sup.4 is nitrogen, while the remainder are carbon; Y.sup.1 and Y.sup.2 are independently selected from NR, O, and S; R, R.sup.A, R.sup.B, and R.sup.C are each independently selected from a variety of substituents, and adjacent substitutions in R, R.sup.A, R.sup.B, and R.sup.C are optionally joined to form a fused ring; ligand L.sup.A is at least a tridentate ligand coordinated to a metal M; M is coordinated to ring A and to ring B through metal-carbene bonds; and the ligand L.sup.A is optionally linked with other ligands to comprise a tetradentate, pentadentate or hexadentate ligand. Formulations and devices, such as an OLEDs, that include the compound with a ligand L.sub.A of Formula I are also described.

A compound having a first ligand L.sub.A of Formula I

##STR00001##

is disclosed, where Z.sup.1 to Z.sup.4 are each independently C or N; at least one of Z.sup.1 to Z.sup.4 is N; and ring A is a structure of Formula II

##STR00002##

A compound comprising a first ligand L.sub.A of Formula I,

##STR00001##

is disclosed. In the structure of Formula I, ring A is a 5-membered or 6-membered carbocyclic or heterocyclic ring; Z.sup.1-Z.sup.4 are each independently C or N; at least two consecutive Z.sup.1-Z.sup.4 are C, and are fused to a structure of Formula II

##STR00002##

or Formula III

##STR00003##

Y.sup.1; Y.sup.1 and Y.sup.2 are each independently O, S, Se, CRR′, SiRR′, or GeRR′; each R.sup.A, R.sup.B, R.sup.C, R, and R′ is a hydrogen or a substituent; and any two substituents may be joined or fused together to form a ring. In the compound, L.sub.A is complexed to a metal M by the dashed lines in Formula I to form a five-membered chelate ring, and M has an atomic weight greater than 40. Organic light emitting devices and consumer products containing the compounds are also disclosed.

An organometallic compound represented by Formula 1:
M(L.sub.1).sub.n1(L.sub.2).sub.n2  Formula 1
wherein, in Formula 1, M is a transition metal, L.sub.1 is a ligand represented by Formula 2A, L.sub.2 is a ligand represented by Formula 2B, n1 is 1 or 2, wherein, when n1 is 2, two groups L.sub.1 are identical to or different from each other, n2 is 1 or 2, wherein, when n2 is 2, two group L.sub.2 are identical to or different from each other, the sum of n1 and n2 is 2 or 3, and L.sub.1 and L.sub.2 are different from each other ##STR00001##
wherein X.sub.1, ring CY.sub.1, ring CY.sub.2, ring CY.sub.14, R.sub.1 to R.sub.3, R.sub.11 to R.sub.14, Z.sub.1 to Z.sub.3, a1, a2, a3, b1, and c1 are the same as described in the description, and * and *′ in Formulae 2A and 2B each indicate a binding site to M in Formula 1.

Provided are an electroluminescent material and a device thereof. The electroluminescent material is a metal complex having a ligand represented by Formula 1 and can be used as light-emitting materials in electroluminescent devices. These new metal complexes can effectively regulate and control the luminescence wavelength, reduce the drive voltage of electroluminescent devices, greatly improve the current efficiency, power efficiency and EQE of electroluminescent devices, prolong the device lifetime, and provide better device performance. Further provided are an electroluminescent device and a compound composition.

Provided are organometallic compounds of formula Os(L.sub.A).sub.x(L.sub.B).sub.y(L.sub.C).sub.z, where L.sub.A has a structure of Formula I with the two indicated dashed lines for coordination to Os:

##STR00001##

Also provided are formulations comprising these organometallic compounds. Further provided are OLEDs and related consumer products that utilize these organometallic compounds.

The present application discloses complexes useful as catalysts for organic chemical synthesis including hydrogenation and dehydrogenation of unsaturated compounds or dehydrogenation of substrates. The range of hydrogenation substrate compounds includes esters, lactones, oils and fats, resulting in alcohols, diols, and triols as reaction products. The catalysts of current application can be used to catalyze a hydrogenation reaction under solvent free conditions. The present catalysts also allow the hydrogenation to proceed without added base, and it can be used in place of the conventional reduction methods employing hydrides of the main-group elements. Furthermore, the catalysts of the present application can catalyze a dehydrogenation reaction under homogenous and/or acceptorless conditions. As such, the catalysts provided herein can be useful in substantially reducing cost and improving the environmental profile of manufacturing processes for variety of chemicals.

A compound of the formula ML.sub.AL.sub.B where ligand L.sub.A is of Formula I, and ligand L.sub.B is of Formula II below. ##STR00001## M is selected from Os(II) or Ru(II), and the compound ML.sub.AL.sub.B has a formal neutral charge; and rings A, B, C, D, E, and F are independently a 5-membered or 6-membered aromatic ring, and R.sup.A, R.sup.B, R.sup.C, R.sup.D, R.sup.E,and R.sup.F each independently represent mono to the maximum allowable substitution, or no substitution. L.sup.1, L.sup.2, L.sup.3, and L.sup.4 independently represent a single bond or an organic linking group; W.sup.1, W.sup.2, W.sup.3, and W.sup.4 are independently selected from carbon or nitrogen; Y.sup.1, Y.sup.2, Y.sup.3, and Y.sup.4 are independently selected from carbon or nitrogen; and Z.sup.1, Z.sup.2, and Z.sup.3 are independently selected from carbon or nitrogen, and at least one of Z.sup.1, Z.sup.2, and Z.sup.3 is nitrogen. An organic electroluminescent device that includes an anode, a cathode, and an organic layer comprising a compound of the formula ML.sub.AL.sub.B where ligand L.sub.A is of Formula I, and ligand L.sub.B is of Formula II above. A consumer product comprising an organic light-emitting device (OLED) above.