Table 1. Crystal data and structural refinement details for ethyl azocinnamate (I–IV).

	I	II	III	IV
Empirical formula	C22H22N2O4	C22H22N2O4	C22H22N2O4	C22H22N2O4
Formula weight	378.41	378.41	378.41	378.41
Crystal system	Triclinic	Orthorhombic	Monoclinic	Monoclinic
Space group	P1̄	P212121	P21/c	P21
a/Å	5.9187(2)	3.91720(10)	13.4185(5)	8.8556(2)
b/Å	8.0533(3)	9.6395(2)	9.8231(4)	10.0594(3)
c/Å	10.5862(3)	50.1648(11)	7.2136(3)	21.7173(6)
α/°	99.782(3)	90	90	90
β/°	96.732(3)	90	90.961(4)	98.001(3)
γ/°	102.517(3)	90	90	90
Volume/Å3	479.17(3)	1894.22(7)	950.70(7)	1915.79(9)
Z	1	4	2	4
Z′	0.5	1	0.5	2
ρ calc g cm−3	1.311	1.327	1.322	1.312
μ/mm−1	0.742	0.751	0.748	0.742
F(000)	200.0	800.0	400.0	800.0
Crystal size/mm3	0.21 × 0.11 × 0.09	0.32 × 0.05 × 0.02	0.14 × 0.07 × 0.01	0.29 × 0.08 × 0.01
Radiation	CuKα (λ = 1.54184 Å)	CuKα (λ = 1.54184 Å)	CuKα (λ = 1.54184 Å)	CuKα (λ = 1.54184 Å)
2Θ range for data collection/°	8.586 to 154.632	7.048 to 147.28	6.588 to 152.874	4.108 to 154.092
Index ranges	−7 ≤ h ≤ 7, −10 ≤ k ≤ 10, −13 ≤ l ≤ 12	−1 ≤ h ≤ 4, −11 ≤ k ≤ 11, −62 ≤ l ≤ 60	−16 ≤ h ≤ 16, −12 ≤ k ≤ 11, −8 ≤ l ≤ 8	−10 ≤ h ≤ 9, −12 ≤ k ≤ 12, −26 ≤ l ≤ 27
Reflections collected	9088	8816	8654	22 630
Independent reflections	1892 [Rint = 0.0282, Rsigma = 0.0200]	3665 [Rint = 0.0250, Rsigma = 0.0338]	1866 [Rint = 0.0295, Rsigma = 0.0269]	7157 [Rint = 0.0405, Rsigma = 0.0422]
Data/restraints/parameters	1892/0/129	3665/0/255	1866/0/128	7157/1/509
Goodness-of-fit on F2	1.058	1.044	1.067	1.031
Final R indexes [I ≥ 2σ(I)]	R 1 = 0.0362, wR2 = 0.1011	R 1 = 0.0356, wR2 = 0.0915	R 1 = 0.0386, wR2 = 0.0977	R 1 = 0.0378, wR2 = 0.0980
Final R indexes [all data]	R 1 = 0.0404, wR2 = 0.1057	R 1 = 0.0398, wR2 = 0.0942	R 1 = 0.0455, wR2 = 0.1032	R 1 = 0.0420, wR2 = 0.1006
Largest diff. peak/hole/e Å−3	0.24/−0.18	0.29/−0.14	0.22/−0.17	0.35/−0.19
Flack parameter	n/a	−0.04(13)	n/a	0.39(9)