Knowledge Bank

The metal-metal bond in CrCu molecule has been Investigated via ESR spectroscopy at $4\circ K$ . The molecule was produced by the simultaneous deposition of the Separately vaporized metals into solid argon or krypton matrices at $4\circ K$ . Fine structure in the spectrum established that the ground electronic state is $\mathrm{<mrow\; data-mjx-texclass="ORD">6</mrow>}\Sigma$ with a zero-field-splitting parameter $|D|=0.003(1)$ $cm-1$ $\mathrm{<mrow\; data-mjx-texclass="ORD">63</mrow>}Cu$ hyperfine and quadrupole coupling constants are $|A\perp |=860(10),|A11|=430(60)$, and |eqQ| = 400(100) MHz, with $g\perp \equiv g11\equiv ge$. $\mathrm{<mrow\; data-mjx-texclass="ORD">53</mrow>}Cr$ hyperfine structure was unresolved. The anisotropy and the decreased magnitude of the Cu hyperfine relative to the Cu atom indicates bonding via the s electrons with participation of d`{s} orbitals.