Table 1 The bond lengths (distances) around Eu2+ center in EuX2–Nn.

From: Highly efficient and air-stable Eu(II)-containing azacryptates ready for organic light-emitting diodes

 

EuBr2–N4

EuI2–N4

EuBr2–N8

EuI2–N8

Eu–Xa

4.9097(3)

5.3019(2)

3.3129(8)

3.6170(4)

  

4.8539(11)

4.8205(5)

Eu–N1b

2.660(3)

2.671(5)

2.907(6)

3.027(3)

Eu–N2

2.691(4)

2.724(5)

2.830(15)

2.790(3)

Eu–N3

2.698(4)

2.712(6)

2.787(6)

2.839(4)

Eu–N4

2.683(3)

2.672(6)

2.932(5)

3.040(3)

Eu–N5

2.686(4)

2.724(5)

2.792(5)

2.761(3)

Eu–N6

2.725(4)

2.671(5)

2.716(5)

2.789(3)

Eu–N7

2.723(3)

2.672(6)

2.773(6)

2.758(3)

Eu–N8

2.689(4)

2.712(6)

2.738(12)

2.819(3)

  1. aThe EuX2–N4 structures only have one Eu–X distance, while in EuX2–N8, one halide directly bonds to center Eu2+ ion (inner sphere) and the other is in the outer sphere.
  2. bThe labels for nitrogen atoms in EuX2–N4 is named as 1–4 and 5–8 for two N4 ligands. The labels in EuX2–N8 are shown in Fig. 1.
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