Compound, material for organic electroluminescent elements, organic electroluminescent element and electronic device

1. A compound represented by formula (1):

wherein:

each of R 1 to R 6 is independently an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 50 ring carbon atoms, a haloalkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, a haloalkoxy group having 1 to 20 carbon atoms, an aryl group having 6 to 18 ring carbon atoms, an aryloxy group having 6 to 50 ring carbon atoms, a halogen atom, or a cyano group;

a is an integer of 0 to 3, b is an integer of 0 to 1, c is an integer of 0 to 4, d is an integer of 0 to 4, e is an integer of 0 to 2, and f is an integer of 0 to 3; each of (R 1 ) 0 , (R 2 ) 0 , (R 3 ) 0 , (R 4 ) 0 , (R 5 ) 0 , and (R 6 ) 0 respectively means that R 1 , R 2 , R 3 , R 4 , R 5 , or R 6 is not present; adjacent two groups selected from R 1 to R 3 are not bonded to each other, thereby failing to form a ring structure; and adjacent two groups selected from R 4 to R 6 are not bonded to each other, thereby failing to form a ring structure;

each of L 1 to L 3 is independently a single bond or an unsubstituted arylene group having 6 to 12 ring carbon atoms with the proviso that L 1 is a single bond and at least one of L 2 and L 3 is not a single bond;

wherein Ar is represented by any one of formulae (a), (b-1) to (b-3), (c-1) to (c-3), and (d-1) to (d-3):

wherein:

each R in formula (a) is independently an alkyl group having 1 to 20 carbon atoms;

each R in formulae (b-1) to (b-3), (c-1) to (c-3), and (d-1) to (d-3) is independently an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 50 ring carbon atoms, an aryl group having 6 to 18 ring carbon atoms, an aralkyl group having 7 to 30 carbon atom which includes an aryl group having 6 to 18 ring carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryloxy group having 6 to 18 ring carbon atoms, a haloalkyl group having 1 to 20 carbon atoms, a haloalkoxy group having 1 to 20 carbon atoms, a mono-, di-, or tri-substituted silyl group including a substituent selected from an alkyl group having 1 to 20 carbon atoms and an aryl group having 6 to 18 ring carbon atoms, a cyano group, or a nitro group;

each p is independently an integer of 0 to 5, each q is independently an integer of 0 to 4, each r is independently an integer of 0 to 3, and (R) 0 means that R is not present;

adjacent two Rs in each formula are not bonded to each other, thereby failing to form a ring structure; and

* is a bond to L 1 in formula (1).

2. The compound according to claim 1 , wherein the arylene group of the unsubstituted arylene group having 6 to 12 ring carbon atoms for L 2 to L 3 is selected from the group consisting of divalent groups which are obtained by removing one hydrogen atom from a phenyl group, a biphenylyl group, a biphenylenyl group, a naphthyl group, and an acenaphthylenyl group.

3. The compound according to claim 1 , wherein each of L 2 to L 3 is independently a single bond or an arylene group represented by formula (ii) or (iii):

wherein:

R and q are the same as defined with respect to formulae (a), (b-1) to (b-3), (c-1) to (c-3), and (d-1) to (d-3);

when L 2 is represented by formula (ii) or (iii), one of * and ** is a bond to the phenanthrene structure in formula (1), and the other is a bond to the nitrogen atom in formula (1); and

when L 3 is represented by formula (ii) or (iii) one of * and ** is a bond to the phenanthrene structure in formula (1), and the other is a bond to the nitrogen atom in formula (1).

4. The compound according to claim 1 , wherein L 2 is a single bond.

5. A material for organic electroluminescence devices which comprises the compound according to claim 1 .

6. An organic electroluminescence device comprising a cathode, an anode, and an organic thin film layer disposed between the cathode and the anode, wherein the organic thin film layer comprises one or more layers, the organic thin film layer comprises a light emitting layer, and at least one layer of the organic thin film layer comprises the compound according to claim 1 .

7. The organic electroluminescence device according to claim 6 , wherein the organic electroluminescence device comprises a hole transporting layer between the anode and the light emitting layer, and the hole transporting layer comprises the compound.

8. The organic electroluminescence device according to claim 6 , wherein the organic electroluminescence device comprises an electron blocking layer between the anode and the light emitting layer, and the electron blocking layer comprises the compound.

9. The organic electroluminescence device according to claim 6 , wherein the organic electroluminescence device comprises an exciton blocking layer between the anode and the light emitting layer, and the exciton blocking layer comprises the compound.

10. The organic electroluminescence device according to claim 6 , wherein the organic electroluminescence device comprises an anode-side organic thin film layer between the anode and the light emitting layer, the anode-side organic thin film layer comprises one or more layers, and at least one layer of the anode-side organic thin film layer comprises the compound.

11. The organic electroluminescence device according to claim 10 , wherein the anode-side organic thin film layer comprising two or more layers comprises two or more hole transporting layers, and a hole transporting layer closest to the anode comprises the compound.

12. The organic electroluminescence device according to claim 10 , wherein the anode-side organic thin film layer comprising two or more layers comprises two or more hole transporting layers, and a hole transporting layer closest to the light emitting layer comprises the compound.

13. An electronic device comprising the organic electroluminescence device according to claim 6 .

14. The compound according to claim 1 , wherein a, c, d, e and f are independently an integer of 0 to 1.