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Updated: May 16, 2025
![[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)
[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
Published on: May 21, 2019
Brightly emissive octahedral Cu4X4 clusters showing polymorphic-dependent and mechanochromic phosphorescence
Andrey Yu Baranov1, Evgeniya P Doronina2, Irina Yu Bagryanskaya3
1Nikolaev Institute of Inorganic Chemistry, SB RAS, 3, Lavrentiev Ave., 630090 Novosibirsk, Russia. chemisufarm@yandex.ru.
Abstract:
A series of [Cu4X4L2] clusters (X = Cl, Br, and I) with an octahedral Cu4X4 core have been synthesized using bis(t-butyl)(2-pyridyl)phosphine (L1) and bis(2-pyridyl)-t-butylphosphine (L2). At room temperature, these clusters exhibit bright 3(M+X)LCT phosphorescence (λmax = 514-570 nm) with quantum yields of up to 84% and lifetimes of 3-22 μs. Equally important, polymorphic-dependent and mechanochromic luminescence phenomena have been revealed for the first time in octahedral Cu4X4 clusters. Thus, two polymorphs of [Cu4Br4(L1)2] exhibit green and yellow-green phosphorescence with different emission efficiencies and lifetimes. The cluster [Cu4I4(L2)2] features two emission bands at 530 and 600 nm, which probably belong to 3(M+X)LCT and 3CC phosphorescence. When the powder of [Cu4I4(L2)2] is ground, these bands gradually merge into an averaged band at 575 nm, and when a small amount of CH3CN is added, the two original bands are recovered.
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