AN OCTAPHENYL-SUBSTITUTED BICYCLIC ORGANOMETALLIC INCLUSION HOST

As part of a study involving design of new organometallic hosts, Pd-2( dpm)(2)Cl-2 5 was reacted with 4-isocyanoacetophenone 6 to produce the organometallic insertion product 7. This forms an unstable ternary in clusion compound (7).(chloroform).(dimethyl sulfoxide) whose X-ray cry stal structure [C59H51Cl2NOP4Pd2 . CHCl3 . C2H6OS, P2(1)2(1)2(1), a = 14.734(2), b = 15.782(2), c = 26.682(4) Angstrom, Z = 4, R = 0.043] wa s determined. The host phenyl groups intermesh producing a helical arr angement of molecules of 7 generated by a 2, screw axis. Chloroform gu ests form a second helix intertwining that of the organometallic host through involvement in C=O ... H-CCl3 hydrogen bonds. The dimethyl sul foxide guests exhibit no significant short intermolecular contacts.