east one heteroatom selected from the group consisting of oxygen and fluorine; a sulfonate (???OSO2R4), wherein R4 is a monovalent hydrocarbyl containing 1 to 6 carbon atoms, and optionally includes at least one heteroatom selected from the group consisting of oxygen and fluorine; an acetamido (???NR5C(???O)R6), wherein R5 and R6 are a hydrogen or a monovalent hydrocarbyl containing 1 to 6 carbon