The Use of a Flexible Calix[4]arene Template to Stabilize a Cyclooctatetraindiyl Samarium-Potassium Complex

Table 1

Calix[4]arene elliptical parameters^a in 3 compared to compounds 2 and 4 ^a.

Compound	Da (Å)	Db (Å)	𝜀	Reference
3
Ring I	9.937(5)	5.467(5)	0.835	—
Ring II	9.854(5)	5.396(5)	0.836	—
2
Ring I	9.689(3)	5.816(3)	0.799	[15]
4
Ring I	8.861(4)	7.752(4)	0.484	id
Ring II	9.668(4)	7.441(4)	0.638	id
Ring III	9.503(4)	5.694(4)	0.800	id

aDa, Db, and 𝜀 are the long and short distances and eccentricity of the ellipse which encompasses the four para aromatic carbons of the ligand.