Table 2. TE coefficients for crystals with errors denoted in parentheses and approximate crystallographic axes denoted in brackets.

The solids are divided into sections based on crystal packing. The average values for solids with the same packing are provided at the bottom of each section.

Crystal	α X 1 (MK−1) [axis]	α X 2 (MK−1) [axis]	α X 3 (MK−1) [axis]	αV (MK−1)
Herringbone crystal packing
Olefin-I	−2 (1) [0 1 0]	68 (5) [0 0 1]	128 (1) [−1 0 0]	194 (3)
Olefin-Br	11 (1) [0 1 0]	83 (2) [0 0 1]	114 (1) [−1 0 0]	209 (2)
Olefin-I Br	0.5 (0.5) [0 1 0]	75 (1) [0 0 1]	115 (2) [−1 0 0]	191 (2)
Imine-I	8 (1) [0 −1 0]	70 (1) [0 0 1]	134 (1) [1 0 0]	212 (2)
Azo-I	24 (1) [0 −1 0]	60 (1) [0 0 1]	120 (1) [1 0 0]	205 (3)
Diolefin-I	−18 (4) [0 −1 0]	71 (1) [0 0 1]	135 (4) [1 0 0]	194 (9)
Diolefin-Br	−4 (1) [0 1 0]	76 (2) [0 0 1]	114 (3) [−1 0 0]	187 (3)
Diolefin-I Br	−15 (1) [0 1 0]	78 (1) [0 0 1]	131 (3) [−1 0 0]	195 (3)
Di­imine-I	−9 (1) [0 1 0]	74 (2) [0 0 −1]	120 (1) [−1 0 0]	186 (3)
Di­imine-Br	−12 (1) [0 1 0]	75 (1) [0 0 −1]	133 (1) [−1 0 0]	196 (3)
Average coefficients for herringbone	−2	73	124	197
Herringbone crystal packing (with a phase transition)
Diazo-I†	38 (4) [0 1 0]	41 (4) [1 0 -2]	120 (3) [-3 0 -2]	199 (2)
Face-to-face π-stacked crystal packing
Imine-Br	0 (1) [1 0 2]	43 (1) [0 −1 0]	162 (3) [1 0 0]	206 (2)
Azo-Br(a)	16 (1) [1 0 9]	52 (1) [0 −1 0]	122 (2) [1 0 0]	191 (3)
Azo-I Br	12 (1) [0 0 1]	52 (2) [0 −1 0]	134 (3) [1 0 0]	199 (3)
Diazo-Br	9 (2) [−1 0 4]	42 (1) [0 1 0]	114 (3) [−1 0 0]	166 (4)
Diazo-I Br	10 (1) [1 0 −2]	42 (1) [0 −1 0]	120 (2) [1 0 0]	173 (2)
Average coefficients for π-stacked	9	46	130	187

^†Only the VT SCXRD data between 190 and 250 K for diazo-I are used for the TE calculations due to a phase transition. The diazo-I coefficients are not included with the average values for the other herringbone structures because the calculations do not encompass the same temperature range.