Fig. 1: Au4 and Au2Cu2 cluster structures.
From: Tightly bonded excitons in chiral metal clusters for luminescent brilliance
a Structures of R-Au4(L)4 and R-Au2Cu2(L)4; optical microscopy images of the crystals under UV light. Color codes: C, gray; S, yellow; N, blue; H atoms are omitted for clarity. b Metal atom distances of the optimized rhomboid cores in R-Au2Cu2(iptt)4, R-Au2Cu2(mtt)4, R-Au2Cu2(ptt)4, and R-Au4(ptt)4. For R-Au2Cu2(iptt)4, the other three Au-Cu lengths are 2.84, 2.89, and 2.90 Å. For R-Au4(ptt)4, the other three Au-Cu lengths are 3.14, 3.10, and 3.07 Å. Color codes: Au, orange; Cu, lavender.
