Abstract: 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.

Cite: 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 OpenAlex

Identifiers:

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

Citing:

DB	Citing
Web of science	21
Scopus	21
Elibrary	20
OpenAlex	22

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