INCLUSION PROPERTIES OF PALLADIUM(II) AND PLATINUM(II) HYDROQUINONYLPHOSPHINE COMPLEXES - THE MOLECULAR AND CRYSTAL-STRUCTURES OF TRANS-[PDCL2(PPHQH(2))(2)]CENTER-DOT(ACETONE)(2), TCL2(PPHQH(2))(2)]CENTER-DOT(DIMETHYLFORMAMIDE)(4) AND TRANS-[PDCL2(PPHQME(2))(2)]

The X-ray single crystal structures of two p-hydroquinonylphosphine co mplexes, trans-[PdCl2(pphqH(2))(2)] (1) and trans-[PtCl2(pphqH(2))(2)] (2), and one p-hydroquinonyldimethyletherphosphine complex, trans-[Pd Cl2(pphqMe(2))(2)] (3), are described. 1 co-crystallizes with two mole cules of lattice-included acetone ((1).(acetone)(2)) in the monoclinic space group C2/m with Z=2 and cell constants a=13.857(6), b=13.589(3) , c=11.863(5) Angstrom, beta=104.68(2)degrees. Intermolecular hydrogen bonding between molecules of 1 leads to channels that run parallel to the c axis and which include the acetone guest molecules. Complex 2 c o-crystallizes with four molecules of dimethylformamide solvent ((2).( DMF)(4)) in the triclinic space group <P(1)over bar > with Z=1 and cel l constants a=10.500(6), b=11.927(8), c=12.225(6) Angstrom, alpha=64.6 5(5), beta=66.74(5), gamma=78.84(5)degrees. Each dimethylformamide mol ecule in (2).(DMF)(4) is hydrogen bonded to one of the four O-H groups of 2. Complex 3 crystallizes in the triclinic space group <P(1)over b ar > with Z=1 and cell constants a=9.063(5), b=10.548(7), c=11.596(8) Angstrom, alpha=111.57(3), beta=111.26(3), gamma=90.09(4)degrees. It i s shown that there is a close relationship between the molecular struc tures and the co-crystalline behavior of 1 and 2 and the molecular str uctures and inclusion properties of organic 'wheel-and-axle' host mole cules. The analogy is extended to provide some guidelines for the desi gn of new inorganic host molecules.