Moisture-Catalyzed Slow Release of Sex Pheromone from Microcrystals in Controlling Phyllophaga Pests

Pathik Sahoo1*Email

Pradip Das2*Email

1Nano-Materials Field, Functional Chromophores Group, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan.

2Department of Chemistry, Bose Institute, 93/1 AcharyaPrafulla Chandra Road, Kolkata – 700009, West Bengal, India

Abstract

Pheromones form Primary Ammonium Monocarboxylate (PAM) synthons based supramolecular container of sex pheromone to control Phyllopaga pests in greenway. Therein charge-assisted H-bonds are highly stable in aprotic solvents like diethyl ether, dichloromethane, or chloroform, but protic solvent like water disintegrates it even in the moisture state. By preparing the micro-thin needle-shaped supramolecular container, we released sex pheromone under an open atmosphere. Herein, the labile proton in PAM salt drifts from amino acid methyl ester ammonium to carboxylate moiety under moisturized open environment before releasing the pheromone. This moisture-driven pheromone releasing device could be used to trap the pests physically. The nuclear magnetic resonance (NMR) spectroscopy showed the first-order kinetics while releasing the sex pheromone from the supramolecular container in moist air. The density functional theory (DFT) and experimental studies described here establish the green method of releasing the sex pheromone to trap the pests physically. This method could open a window towards pesticide-free green organic farming.

Moisture-Catalyzed Slow Release of Sex Pheromone from Microcrystals in Controlling Phyllophaga Pests