The molecular structure of the title complex has been determined from three-dimensional X-ray diffraction data. The crystal belongs to the monoclinic system, space group P21/c, a=14.934(2), b=8.997(1), c=20.221(3)Å, β=97.44(2)°, Z=4. The molecular structure showed that the tetracyanoquinodimethane (TCNQ) molecule has reacted with one of the propynyl groups of trans-{(PMe3)2Pt(C≡CMe)2} : part of the TCNQ is bonded to the α-carbon atom and the other part to the β-carbon of the propynyl ligand. The platinum atom has a squareplanar geometry; Pt–P=2.302(5) and 2.290(5), Pt–C(C≡CMe3)=2.009(15) and Pt–C(reacted)=2.057(15) Å.

The structure of the 1:1 adduct of “Hector’s base” with arylcyanamides was determined by X-ray analysis of tris-p-bromophenyl derivative (1a). The molecule is almost planar and the strong interaction was exemplified between the sulfur and the nitrogen atoms.

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The molecular structure of the title compound has been determined from three-dimensional X-ray diffraction data. The crystal belongs to the triclinic system: P\bar1, a=11.488(2), b=18.163(2), c=10.998(2)Å, α=101.70(2), β=118.29(1), γ=85.32(3)°, Z=2. The structure has been refined by block-diagonal least-squares techniques using 3749 non-zero reflections to the final R value of 0.067. The rhodium atom is coordinated in a slightly distorted square-planar geometry by the bisphosphine and the diene ligand, with average Rh–P and Rh–C distances of 2.301(2) and 2.26(1)Å, respectively. The seven-membered chelate ring takes a distorted boat conformation, and the two phenyl groups of diphenylphosphine are arranged in a face-edge manner and those of the other diphenylphosphine are in a helical arrangement like a propeller, viewed from cycloocta diene.