sanya
sanya@photonics.ru
If you use ECP for Br, you should also use corresponding basis set. SBKJC ECP is not compatible with 6-311G on the same atom. Take it from https://bse.pnl.gov/bse/portal.
You may give ECP and basis set explicitly:
BR 35.0 -0.8373221010 0.0000004108 0.0018763918
P 1
1 0.027070900 1.0000000
L 4
1 3.276000000 0.20057000 0.00541100
2 2.044000000 -0.64929600 -0.13239100
3 0.639800000 0.40540100 0.43002700
4 0.256100000 0.87260700 0.68600900
L 1
1 0.095670000 1.00000000 1.00000000
D 2
1 1.946447000 1.00000000
2 0.225471000 -0.71482300
D 2
1 0.153987200 1.00000000
2 0.058464100 0.92023200
in the $DATA group and
BR-ECP GEN 28 3
1 ----- f-ul potential -----
-4.7820600 1 2.1211600
2 ----- s-ul potential -----
2.6019000 0 3.2153800
44.1516500 2 3.2163900
2 ----- p-ul potential -----
2.0947800 0 2.7270400
30.5954600 2 2.7276200
2 ----- d-ul potential -----
1.7937500 0 1.7316800
10.0466000 2 1.7324600
in the $ECP group.