Excitation wavelength dependent emission of silver(i) complexes with a pyrimidine ligand

Excitation wavelength dependent emission of silver(i) complexes with a pyrimidine ligand Full article

Journal

Inorganic Chemistry Frontiers
ISSN: 2052-1553

Output data

Year: 2020, Volume: 7, Number: 11, Pages: 2212-2223 Pages count : 12 DOI: 10.1039/d0qi00254b

Authors

Shekhovtsov Nikita A. ^1,2 , Vinogradova Katerina A. ^1,2 , Berezin Alexei S. ¹ , Sukhikh Taisiya S. ¹ , Krivopalov Viktor P. ³ , Nikolaenkova Elena B. ³ , Bushuev Mark B. ^1,2

Affiliations

1	(Данные Web of science) Russian Acad Sci, Siberian Branch, Nikolaev Inst Inorgan Chem, 3 Acad Lavrentiev Ave, Novosibirsk 630090, Russia
2	(Данные Web of science) Novosibirsk State Univ, 2 Pirogova Str, Novosibirsk 630090, Russia
3	(Данные Web of science) Russian Acad Sci, Siberian Branch, NN Vorozhtsov Novosibirsk Inst Organ Chem, 9 Acad Lavrentiev Ave, Novosibirsk 630090, Russia

Silver(i) complexes with 2-amino-4-phenyl-6-methylpyrimidine (L), [Ag3L2(H2O)(0.55)(NO3)(3)](n) (1) and [Ag2L2(PPh3)(2)(NO3)(2)] (2), have been synthesized and structurally characterized. In the solid state the free ligand L demonstrates dual fluorescence: a high energy band at 375 nm is the emission of the monomer L while a low-energy band at 450 nm can be attributed to the emission of the tautomeric dimer, L-2-imino, formed in the excited state double proton transfer (ESDPT) process. In the solid state the complexes demonstrate excitation wavelength dependent photoluminescence originating from three emission mechanisms (hereafter abbreviated as A, B and C for complex 1; A ', B ' and C ' for complex 2). The spectroscopic and computational results reveal that these emission mechanisms can be assigned to metal + nitrate anion to ligand L charge transfer phosphorescence (mechanisms A and A '), excimer (1)pi-pi* fluorescence (mechanism B), fluorescence of L-2-imino dimeric units formed due to ESDPT (mechanism B ') and ligand-centered (1)pi-pi*/(1)n-pi* fluorescence (mechanisms C and C '). The luminescence of complex 1 at lambda(ex) = 340 nm shows thermochromic behavior; the emission color dramatically changes from blue-green at 77 K to yellowish green at 175 K and white at 300 K.

Shekhovtsov N.A. , Vinogradova K.A. , Berezin A.S. , Sukhikh T.S. , Krivopalov V.P. , Nikolaenkova E.B. , Bushuev M.B.
Excitation wavelength dependent emission of silver(i) complexes with a pyrimidine ligand
Inorganic Chemistry Frontiers. 2020. V.7. N11. P.2212-2223. DOI: 10.1039/d0qi00254b WOS Scopus РИНЦ

Web of science	WOS:000539265900007
Scopus	2-s2.0-85090774757
Elibrary	45331813
OpenAlex	W3019665461