Table 2. Some parameters related to the molecular conformations of the polymorphs of THPs 1–3 .

THP	1		2		3
Pol a	1b	1c	2c	2c′	3p	3b	3c
PM b	RS	RR/SS	RS	RR/SS	RS	RR/SS	RR/SS
λ em c /nm	434	484	469	484	425	445	468
ΔE 1 d /eV	2.86	2.57	2.65	2.57	2.92	2.79	2.66
α e /°	49.24	36.46	48.62	31.81	53.04	43.50	34.50
ΔE 2 f /eV	4.47	4.17	4.50	4.22	4.55	4.45	4.29
λ bg f /nm	278	298	276	295	273	279	290
λ ex g /nm	355	409	370	387	330	365	390
Δ λ ex–λ bg /nm	77	111	94	92	57	86	100
Δ λ ab–λ bg /nm	39	19	41	22	47	41	30

^aPol: polymorph.

^bPM: packing mode.

^cPeak emission wavelength.

^dThe energy of the peak emission wavelength.

^eDihedral angle between phenyl C and the –C C-plane.

^fBand gap between the HOMO and LUMO.

^gPeak excitation wavelength at lower energy area.