Disturbance of intermolecular forces: eutectics as a new tool for the preparation of vapor-phase deposition precursors

Michael A Land; Katherine N Robertson; Jason A C Clyburne; Seán T Barry

doi:10.1039/d2cp05341a

Disturbance of intermolecular forces: eutectics as a new tool for the preparation of vapor-phase deposition precursors

Phys Chem Chem Phys. 2023 Mar 22;25(12):8336-8340. doi: 10.1039/d2cp05341a.

Authors

Michael A Land¹, Katherine N Robertson², Jason A C Clyburne², Seán T Barry¹

Affiliations

¹ Department of Chemistry, Carleton University, Ottawa, Ontario, K1S 5B6, Canada. Michael.land@carleton.ca.
² Department of Chemistry, Saint Mary's University, Halifax, Nova Scotia, B3H 3C3, Canada.

PMID: 36916546
DOI: 10.1039/d2cp05341a

Abstract

The volatile bis(tert-butylimido)dichloromolybdenum(VI) compounds, (tBuN)₂MoCl₂·dad (dad = 1,4-di-tert-butyl-1,3-diazabutadiene) (1) and [(tBuN)₂MoCl(μ-Cl)·(tBuNH₂)]₂ (2), form a eutectic, with a two to one composition (χ₂ = 0.33). A decrease of 40 °C in the melting temperature has been observed between the eutectic mixture and the pure compounds. We have isolated a co-crystal of (tBuN)₂MoCl₂·dme (dme = 1,2-dimethoxyethane) (3) and 2, also in a two to one ratio, which serves as a structural model for such mixtures. The lower melting point of carefully chosen eutectic mixtures can offer more consistent precursor delivery in deposition processes.