. 2021 Sep 3;60(18):14116–14131. doi: 10.1021/acs.inorgchem.1c01503

Table 2. Measurements of the Distortion from Tetrahedral to Square-Planar Geometry in Bis[(R or S)-N-1-(p-X-C₆H₄)ethyl-2-oxo-1-naphthaldiminato-κ²N,O]-Λ- or Δ-M(II).

complex [M-(R or S)-L]	ligand substituent (X)	ligand chirality	Δ or Λ chirality induction	θ/deg^b	τ_tet-sq = θ/90°	τ₄^c	ref
M = Co	H (A/B)^a	(S)-L1	Δ	88.14/88.52	0.98/0.98	0.83/0.82	this work
		(R)-L1	Λ	87.95/88.57	0.98/0.98	0.83/0.82
	p-CH₃O	(R)-L2	Λ	82.36	0.92	0.80
	p-Br (A/B)^a	(S)-L3	Δ	84.76/82.63	0.94/0.92	0.83/0.81
M = Cu	H	(S)-L1	Δ	27.0	0.30	0.27	(20)
		(R)-L1	Λ	26.5	0.29	0.27
	p-Br	(R)-L3	Λ	3.88	0.04	0.04
M = Ni	H (A/B)^a	(S)-L1	Δ	9.98/1.73	0.11/0.02	0.10/0.02	(21)
		(R)-L1	Λ	10.00/1.80	0.11/0.02	0.10/0.02
M = Zn	H (A/B)^a	(S)-L1	Δ	88.78/88.03	0.99/0.98	0.84/0.83	(26)
		(R)-L1	Λ	88.89/88.24	0.99/0.98	0.83/0.83
	p-CH₃O (A/B)^a	(S)-L2	Δ	83.37/88.45	0.93/0.98	0.83/0.83
		(R)-L2	Λ	88.54/83.48	0.98/0.93	0.83/0.83

Two symmetry-independent molecules with A and B in an asymmetric unit with a single diastereomer (Λ or Δ).

Dihedral angle between the two coordinating planes N1–Co–O1 and N2–Co–O2.

τ₄ = [360° – (α + β)]/141°, where α and β are the two largest angles (N–Co–N and O–Co–O) in the four-coordinate species;⁵⁰ see Tables S2 and S3.

Table 2. Measurements of the Distortion from Tetrahedral to Square-Planar Geometry in Bis[(R or S)-N-1-(p-X-C6H4)ethyl-2-oxo-1-naphthaldiminato-κ2N,O]-Λ- or Δ-M(II).