Decacarbon­yl[μ₄-(ethane-1,2-diyl­dinitrilo)­tetra­kis­(methane­thiol­ato)]bis(triphenyl­phosphane)tetra­iron(2 Fe—Fe)

In the title compound, [Fe₄(C₆H₁₂N₂S₄)(C₁₈H₁₅P)₂(CO)₁₀], the unit cell contains one mol­ecule, which exhibits a crystallographically imposed center of symmetry. The independent Fe₂S₂ fragment [Fe—Fe = 2.527 (1) Å] is in a butterfly conformation, and each Fe atom displays a pseudo-square-pyramidal coordination geometry. The phosphane group occupies an apical position [Fe—P = 2.2670 (14) Å]. In the crystal, weak inter­molecular C—H...O hydrogen bonds link the mol­ecules into chains along [110].

(E)-4-Amino-N′-(5-chloro-2-hy­droxy­benzyl­idene)benzohydrazide

The title compound, C₁₄H₁₂ClN₃O₂, displays an E conformation with respect to the C=N double bond. The dihedral angle between the benzene rings is 41.3 (5)°. The mol­ecular structure is stabilized by an intra­molecular O—H...N hydrogen bond. In the crystal, N—H...O and weak N—H...Cl hydrogen bonds link the mol­ecules into a three-dimensional architecture. In addition, there are weak C—H...π stacking inter­actions.

(E)-4-Amino-N′-(2-nitro­benzyl­idene)benzohydrazide

The title Schiff base compound, C₁₄H₁₂N₄O₃, displays an E conformation with respect to the C=N double bond [1.268 (3) Å]. The dihedral angle between the benzene rings is 3.2 (5)°, consistent with an essentially planar mol­ecule. In the crystal, N—H...O and N—H...N hydrogen bonds, as well as C—H...O inter­actions, link the mol­ecules into layers that stack along the c axis.

(4Z)-4-[(2-Chloro­anilino)(phen­yl)methyl­idene]-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one

The title compound, C₂₃H₁₈ClN₃O, exists in an enamine–keto form with the amino group involved in an intra­molecular N—H...O hydrogen bond. The five-membered ring is nearly planar, the largest deviation being 0.0004 (7) Å, and makes dihedral angles of 16.62 (6), 41.89 (5) and 71.27 (4)° with the phenyl rings. In the crystal, weak C—H...O hydrogen bonds link the mol­ecules into supra­molecular chains along the b axis.