Multivariate carboxylate derivatized phenyl-based metal-organic frameworks

A process of selectively separating a constituent from a gas mixture, comprising:

• exposing the gas mixture containing the constituent to a composition consisting essentially of the structure of formula I:
• [R—Ar—(COOH)2]x[Ar—(COOH)3]2-xM3 (I)
• where M is Cu, Co, Fe, Zn, Cd, Ni, Mn, or Pt;
• R is a bromine, a primary amine, C1-C4 alkyl secondary amine, C1-C4 alkyl oxy, Br—(C1-C4 alkyl), NO2—(C1-C4 alkyl), a mercaptan, and reaction products of any of the aforementioned with acyl chlorides of the formulas:
• CH3(CH2)mC(O)Cl, or CH3(CH(C1-C4 alkyl)CH2)mC(O)Cl, or CH3(CH2)m-Ph-(CH2)pC(O)Cl, in which Ph is a C6 phenyl group or C6 phenyl group with one or more hydrogens replaced with F, C1-C4 fluoroalkyl, or C1-C4 perfluoroalkyl;
• m is independently in each occurrence an integer of 0 to 12 inclusive;
• p is an integer of 0 to 36 inclusive, to form an amide, a thioamide, or an ester;
• Ar is a 1,3,5-modified phenyl group, and x is a non-integer value of greater than 0 and less than 1.4;
• and
• collecting a flue gas preferentially depleted in the constituent after contact with the composition.