A complex having the formula (PI)(AE)ML 2 , wherein: I) PI is a phosphinimine ligand defined by the formula: where each R 1 is independently selected from a group consisting of a hydrogen atom; a C 1-30 hydrocarbyl radical, which hydrocarbyl radical is unsubstituted or further substituted by a halogen atom; a C 1-10 alkoxy radical; a C 6-10 aryl or aryloxy radical; an amido radical; a silyl radical or a germanyl radical; II) AE is an amido-ether ligand defined by the formula: where Q is a bridging group between oxygen, O and nitrogen, N 2 , and contains one or more atoms selected from group consisting of Group 13 to 16 elements; R 2 is a group containing 1 to 50 atoms selected from the group consisting of hydrogen and Group 13 to 17 elements; R 3 is a group containing 1 to 50 atoms selected from the group consisting of hydrogen and Group 13 to 17 elements; and wherein the R 2 group optionally joins together with the bridging group Q; III) each L is an activatable ligand; and IV) M is a metal selected from the group consisting of Zr and Hf, and wherein N 1 , N 2 and optionally O are bonded to M; wherein each activatable ligand L is independently selected from the group consisting of a hydrogen atom; a halogen atom; a C 1-10 hydrocarbyl radical; a C 1-10 alkoxy radical; and a C 6-10 aryl oxide radical; each of which said hydrocarbyl, alkoxy, and aryl oxide radicals may be unsubstituted by or further substituted by a halogen atom; a C 1-8 alkyl radical; a C 1-8 alkoxy radical; a C 6-10 aryl or aryloxy radical; an amido radical which is unsubstituted or substituted by up to two C 1-8 alkyl radicals; or a phosphido radical which is unsubstituted or substituted by up to two C 1-8 alkyl radicals; or two activatable ligands L are joined to one another and form a substituted or unsubstituted diene ligand or a delocalized heteroatom containing group. I) PI is a phosphinimine ligand defined by the formula: where each R 1 is independently selected from a group consisting of a hydrogen atom; a C 1-30 hydrocarbyl radical, which hydrocarbyl radical is unsubstituted or further substituted by a halogen atom; a C 1-10 alkoxy radical; a C 6-10 aryl or aryloxy radical; an amido radical; a silyl radical or a germanyl radical; II) AE is an amido-ether ligand defined by the formula: where Q is a bridging group between oxygen, O and nitrogen, N 2 , and contains one or more atoms selected from group consisting of Group 13 to 16 elements; R 2 is a group containing 1 to 50 atoms selected from the group consisting of hydrogen and Group 13 to 17 elements; R 3 is a group containing 1 to 50 atoms selected from the group consisting of hydrogen and Group 13 to 17 elements; and wherein the R 2 group optionally joins together with the bridging group Q; III) each L is an activatable ligand; and IV) M is a metal selected from the group consisting of Zr and Hf, and wherein N 1 , N 2 and optionally O are bonded to M; wherein each activatable ligand L is independently selected from the group consisting of a hydrogen atom; a halogen atom; a C 1-10 hydrocarbyl radical; a C 1-10 alkoxy radical; and a C 6-10 aryl oxide radical; each of which said hydrocarbyl, alkoxy, and aryl oxide radicals may be unsubstituted by or further substituted by a halogen atom; a C 1-8 alkyl radical; a C 1-8 alkoxy radical; a C 6-10 aryl or aryloxy radical; an amido radical which is unsubstituted or substituted by up to two C 1-8 alkyl radicals; or a phosphido radical which is unsubstituted or substituted by up to two C 1-8 alkyl radicals; or two activatable ligands L are joined to one another and form a substituted or unsubstituted diene ligand or a delocalized heteroatom containing group. <EOS>