A process for preparing a composition, the process comprising: (a) combining a linking group, an organometallic compound, a co-catalyst, a solvent, and a first catalyst precursor; wherein the organometallic compound comprises a trivalent metal, a divalent metal, or a mixture of a trivalent metal and a divalent metal; wherein the catalyst precursor is Catalyst (A1) or (A2) as listed below: Catalyst (A1): [N-(2,6-di(1-methylethyl)phenyl)amido)(2-isopropylphenyl)(α-naphthalen-2-diyl(6-pyridin-2-diyl)methane)]hafnium dimethyl] or Catalyst (A2): (E)-((2,6-diisopropylphenyl)(2-methyl-3-(octylimino)butan-2-yl)amino)trimethyl hafnium and (b) obtaining a final solution comprising the composition, wherein the solvent is an aromatic solvent, and wherein the composition has the formula (I): wherein: each MA is Al, B, or Ga; each MB is Zn or Mg; m is a number from 0 to 1; n is a number from 1 to 100; each J1, J2, and J3 is hydrogen or a C 1-20 alkyl group, and wherein J1, J2, and J3 may be the same or different, or mixtures thereof; and ZZ is a linear or branched C 4-100 hydrocarbyl group that optionally includes at least one heteroatom, and wherein ZZ may be aliphatic or aromatic, wherein the composition comprises a single derivative of the linking group, and wherein the linking group is an alpha-omega diene. wherein the organometallic compound comprises a trivalent metal, a divalent metal, or a mixture of a trivalent metal and a divalent metal; wherein the catalyst precursor is Catalyst (A1) or (A2) as listed below: Catalyst (A1): [N-(2,6-di(1-methylethyl)phenyl)amido)(2-isopropylphenyl)(α-naphthalen-2-diyl(6-pyridin-2-diyl)methane)]hafnium dimethyl] or Catalyst (A2): (E)-((2,6-diisopropylphenyl)(2-methyl-3-(octylimino)butan-2-yl)amino)trimethyl hafnium and (b) obtaining a final solution comprising the composition, wherein the solvent is an aromatic solvent, and wherein the composition has the formula (I): wherein: each MA is Al, B, or Ga; each MB is Zn or Mg; m is a number from 0 to 1; n is a number from 1 to 100; each J1, J2, and J3 is hydrogen or a C 1-20 alkyl group, and wherein J1, J2, and J3 may be the same or different, or mixtures thereof; and ZZ is a linear or branched C 4-100 hydrocarbyl group that optionally includes at least one heteroatom, and wherein ZZ may be aliphatic or aromatic, wherein the composition comprises a single derivative of the linking group, and wherein the linking group is an alpha-omega diene. Catalyst (A1): [N-(2,6-di(1-methylethyl)phenyl)amido)(2-isopropylphenyl)(α-naphthalen-2-diyl(6-pyridin-2-diyl)methane)]hafnium dimethyl] or Catalyst (A2): (E)-((2,6-diisopropylphenyl)(2-methyl-3-(octylimino)butan-2-yl)amino)trimethyl hafnium and (b) obtaining a final solution comprising the composition, wherein the solvent is an aromatic solvent, and wherein the composition has the formula (I): wherein: each MA is Al, B, or Ga; each MB is Zn or Mg; m is a number from 0 to 1; n is a number from 1 to 100; each J1, J2, and J3 is hydrogen or a C 1-20 alkyl group, and wherein J1, J2, and J3 may be the same or different, or mixtures thereof; and ZZ is a linear or branched C 4-100 hydrocarbyl group that optionally includes at least one heteroatom, and wherein ZZ may be aliphatic or aromatic, each MA is Al, B, or Ga; each MB is Zn or Mg; m is a number from 0 to 1; n is a number from 1 to 100; each J1, J2, and J3 is hydrogen or a C 1-20 alkyl group, and wherein J1, J2, and J3 may be the same or different, or mixtures thereof; and ZZ is a linear or branched C 4-100 hydrocarbyl group that optionally includes at least one heteroatom, and wherein ZZ may be aliphatic or aromatic, wherein the composition comprises a single derivative of the linking group, and wherein the linking group is an alpha-omega diene. <EOS>