Selected interatomic distances (Å) and angles (deg) of the Bbim²⁻-bridged complexes, 1-Ln^a.

1-Ln	Gd	Tb	Dy
C2–C2′	1.454(5)	1.447(3)	1.455(4)
Av. Ln–N	2.440(4)	2.428(3)	2.423(2)
Ln–Ln	6.239(1)	6.215(1)	6.203(3)
Cnt–Ln–Cnt	138.0(1)	138.0(1)	138.8(1)
Ln1–N1–N2–Ln2	0.1(1)	0.1(1)	11.8(3)°
N1–Ln–N1′	72.0(1)	72.4(1)	72.3(1)

^aCnt = centroid of the pentamethylcyclopentadienyl ring.