The photoisomerization rate constants (k [×10⁻⁴ s⁻¹]), halftimes (t_1/2 [s]) and percentage of cis form determined at 20 °C.

Compound/complex	k	t 1/2	% cis
2+a	14.0	495	79.1
2+b	21.3	326	76.7
2+c	23.7	293	76.6
2+d	16.7	414	66.5
2+e	12.2	566	68.3
2+f/1+f−	10.6	6540	18.7
1	11.2	620	42.8
2	29.1	238	82.2
3	2.9	2402	42.8
4	6.8	1023	64.5