The present invention provides a composition comprising: i) at least one compound of formula (I): wherein R1 and R2 are independently selected from a group consisting of hydrogen, unsubstituted or substituted C1-19 hydrocarbyl or a group of formula (II): wherein Q is a bond or an unsubstituted or substituted hydrocarbyl group; wherein R3 is selected from a group consisting of hydrogen and unsubstituted or substituted C1-18 hydrocarbyl; wherein the R1—C—R2 backbone is from 5 to 20 atoms in length; wherein each A and B is independently an unsubstituted or substituted unsaturated cyclic hydrocarbyl group; and wherein n is an integer from 0 to 10; and ii) a diluent or carrier; wherein the compound(s) of formula (I) is present in an amount sufficient to provide, at −30° C., at least 1 wt % of iron, based on the weight of the composition.