Select bond lengths (Å) for complexes 1 and 2.

	1	2
Fe(1)–Fe(2)	2.5235(2)	2.4911(13)
Fe(1)–S(1)	2.2387(3)	2.228(2)
Fe(1)–S(2)	2.2407(3)	2.247(2)
Fe(2)–S(1)	2.2545(3)	2.247(2)
Fe(2)–S(2)	2.2701(3)	2.257(2)
Fe(1)–P(1)	2.2258(3)	2.164(2)