MOF-1203

Paper: Calcium L-Lactate Frameworks as Naturally Degradable Carriers for Pesticides

Authors: J. Yang, C. A. Trickett, S. B. Alahmadi, A. Alshammari, and O. M. Yaghi

Citation: J. Am. Chem. Soc., 2017, 139, 8118–8121

DOI: 10.1021/jacs.7b04542

Abstract: Two porous, chiral metal-organic frameworks: Ca₁₄(L-lactate)₂₀(Acetate)₈(C₂H₅OH)(H₂O), MOF-1201, and Ca₆(L-lactate)₃(Acetate)₉(H₂O), MOF-1203, are constructed from Ca²⁺ ions and L-lactate [CH₃CH(OH)COO-] where Ca²⁺ is bridged by carboxylate and hydroxyl groups of lactate, and carboxylate of acetate to give a three-dimensional arrangement of Ca(-COO, -OH) polyhedra supporting one-dimensional pores of apertures and internal diameters of 7.8 and 9.6 Å (MOF-1201), and 4.6 and 5.6 Å (MOF-1203), respectively. These MOFs represent the first examples of extended porous structures based on Ca²⁺ and lactate. They show permanent porosity of 430 (MOF-1201) and 160 m² g^-1 (MOF-1203), and can encapsulate an agriculturally important fumigant, cis-1,3-dichloropropene. MOF-1201 shows a 100 times slower release rate compared with liquid cis-1,3-dichloropropene under the same test conditions (25 °C, air flow rate of 1 cm³ min^-1). The hydrolysis of MOF-1201 in water allows it to be the first example of degradable porous solid carrier for such fumigants.