A new supramolecular bonding motif involving NH bonds of ammonium salts and macrocycles derived from platinum corners and butadiynediyl linkers

CuI catalyzes reactions of cis-(R2C(CH2PPh2)(2))Pt(C CC CH)(2) and cis-(R2C(CH2PPh2)(2))PtI2 in secondary amine solvents HNR'(2) to give the title adducts [(R2C(CH inverted right perpendicular(2)PPh(2))(2))Pt(inverted left perpendicular C CC C)](4)center dot(H2NR'I-+(2)-)(n) (R/R'/n = Me/Et/1, Me/((CH2CH2)(2)O)(0.5)/3, Et/Et/1, Et/CH2CH-CH2/1; 92-42%). Crystal structures of these or closely related species establish folded Pt-4 cores containing ammonium cation guests, with NH/ and NCH/C C hydrogen bonding. DOSY NMR experiments show that the host/guest relationship can be maintained in solution.