Novel metal imido calixarene complexes

Treatment of [Mo(NR)2(OBut)2](R = C6H3Pri2-2,6) with calix-4-arene (H4L1) and calix-8-arene (H8L2) affords novel mono- and di-metallocalixarene complexes; the crystal structures of [Mo(NR) L1(NCMe)]1 and [{Mo(NR)(NCMe)}2L2]2, both incorporating additional acetonitrile solvent of crystallisation, are reported.