TY - JOUR

T1 - Luminescence Thermochromism of Gold(I) Phosphane–Iodide Complexes

T2 - A Rule or an Exception?

AU - Glebko, Nina

AU - Dau, Thuy Minh

AU - Melnikov, Alexei S.

AU - Grachova, Elena V.

AU - Solovyev, Igor V.

AU - Belyaev, Andrey

AU - Karttunen, Antti J.

AU - Koshevoy, Igor O.

N1 - Funding Information: Financial support from the Academy of Finland (grant 268993, synthesis and XRD studies, I.O.K.) and the Russian Science Foundation (grant 16-13-10064, spectroscopic and photophysical studies, E.V.G., I.V.S.) is gratefully acknowledged. Computational resources were provided by CSC, the Finnish IT Center for Science (A.J.K.) The NMR spectroscopy and photophysical measurements were performed by using the following core facilities at St. Petersburg State University Research Park: Centre for Magnetic Resonance, and Centre for Optical and Laser Materials Research. The work was carried out using equipment of the “Analytical Center of Nano-and Biotechnologies of SPbSPU” with financial support of Ministry of Education and Science of Russian Federation.

PY - 2018/2/26

Y1 - 2018/2/26

N2 - A series of gold(I) iodide complexes 1–11 have been prepared from di-, tri-, and tetraphosphane ligands. Crystallographic studies reveal that the di- (1–7) and tetrametallic (11) compounds feature linearly coordinated gold(I) ions with short aurophilic contacts. Their luminescence behavior is determined by the combined influence of the phosphane properties, metal–metal interaction, and intermolecular lattice-defined interactions. The proposed variable contribution of 3(X+M)-centered (X=halogen; M=metal) and 3XLCT (halogen to ligand charge transfer) electronic transitions into the lowest lying excited state, which is influenced by supramolecular packing, is presumably responsible for the alteration of room-temperature emission color from green (λ=545 nm, for 11) to near-IR (λ=698 nm, for 2). Dinuclear compounds 6 and 7 exhibit distinct luminescence thermochromism with a blueshift up to 5750 cm−1 upon cooling. Such dramatic change of emission energy is assigned to the presence of two coupled triplet excited states of 3ππ* and 3(X+M)C/3XLCT nature, the presence of which depends on both molecular structure and the crystal lattice arrangement.

AB - A series of gold(I) iodide complexes 1–11 have been prepared from di-, tri-, and tetraphosphane ligands. Crystallographic studies reveal that the di- (1–7) and tetrametallic (11) compounds feature linearly coordinated gold(I) ions with short aurophilic contacts. Their luminescence behavior is determined by the combined influence of the phosphane properties, metal–metal interaction, and intermolecular lattice-defined interactions. The proposed variable contribution of 3(X+M)-centered (X=halogen; M=metal) and 3XLCT (halogen to ligand charge transfer) electronic transitions into the lowest lying excited state, which is influenced by supramolecular packing, is presumably responsible for the alteration of room-temperature emission color from green (λ=545 nm, for 11) to near-IR (λ=698 nm, for 2). Dinuclear compounds 6 and 7 exhibit distinct luminescence thermochromism with a blueshift up to 5750 cm−1 upon cooling. Such dramatic change of emission energy is assigned to the presence of two coupled triplet excited states of 3ππ* and 3(X+M)C/3XLCT nature, the presence of which depends on both molecular structure and the crystal lattice arrangement.

KW - aurophilicity

KW - gold

KW - luminescence

KW - phosphane ligands

KW - thermochromism

UR - http://www.scopus.com/inward/record.url?scp=85041190668&partnerID=8YFLogxK

UR - http://www.mendeley.com/research/luminescence-thermochromism-goldi-phosphaneiodide-complexes-rule-exception

U2 - 10.1002/chem.201705544

DO - 10.1002/chem.201705544

M3 - Article

C2 - 29314337

AN - SCOPUS:85041190668

VL - 24

SP - 3021

EP - 3029

JO - Chemistry - A European Journal

JF - Chemistry - A European Journal

SN - 0947-6539

IS - 12

ER -