TY - JOUR

T1 - Effect of polymorphism on the luminescent properties on silver(I) nitrate complexes with 2-amino-5-phenylpyrazine

AU - Malakhova, Yu A.

AU - Sukhikh, T. S.

AU - Rakhmanova, M. I.

AU - Vinogradova, K. A.

N1 - Funding Information: The work was supported by the grant of the President of the Russian Federation for young scientists (project No. MK-1219.2020.3) and the Ministry of Science and Higher Education of the Russian Federation (projects Nos. 121031700315-2 and 121031700313-8). Publisher Copyright: © 2022, Pleiades Publishing, Ltd.

PY - 2022/3

Y1 - 2022/3

N2 - The reaction between AgNO3 and 2-amino-5-phenylpyrazine (L) at a molar ratio Ag:L = 1.5:1 (synthesis time 3-4 h) in the acetonitrile solution leads to the formation of [AgL2NO3] complex (1). According to the single crystal X-ray diffraction data, two L molecules are coordinated to each silver atom through the N1 atom of the pyrazine ring and one NO3- anion. Polymorph 2 is obtained by the reaction between AgNO3 and L at a 1:2 molar ratio and a short synthesis time (3-30 min). Complex 2 consists of two moieties ([AgL2]+ and [AgL2(NO3)2]–) in which silver atoms have different coordination environments: almost linear and distorted tetrahedral respectively. In photoluminescence spectra of the solid complexes, two emission bands are observed, which appear after light irradiation with different wavelengths. Upon the excitation in the range of 300-400 nm, both complexes exhibit blue emission (λmax = 445 nm for 1, λmax= 430 nm for 2). Upon the excitation with λex = 440-500 nm, green emission is observed (λex = 545 nm for 1, λmax = 530 nm for 2). Both bands are characterized by the biexponential decay kinetics with nano- and microsecond lifetimes of the excited state.

AB - The reaction between AgNO3 and 2-amino-5-phenylpyrazine (L) at a molar ratio Ag:L = 1.5:1 (synthesis time 3-4 h) in the acetonitrile solution leads to the formation of [AgL2NO3] complex (1). According to the single crystal X-ray diffraction data, two L molecules are coordinated to each silver atom through the N1 atom of the pyrazine ring and one NO3- anion. Polymorph 2 is obtained by the reaction between AgNO3 and L at a 1:2 molar ratio and a short synthesis time (3-30 min). Complex 2 consists of two moieties ([AgL2]+ and [AgL2(NO3)2]–) in which silver atoms have different coordination environments: almost linear and distorted tetrahedral respectively. In photoluminescence spectra of the solid complexes, two emission bands are observed, which appear after light irradiation with different wavelengths. Upon the excitation in the range of 300-400 nm, both complexes exhibit blue emission (λmax = 445 nm for 1, λmax= 430 nm for 2). Upon the excitation with λex = 440-500 nm, green emission is observed (λex = 545 nm for 1, λmax = 530 nm for 2). Both bands are characterized by the biexponential decay kinetics with nano- and microsecond lifetimes of the excited state.

KW - coordination compounds

KW - lifetime

KW - luminescence polymorphism

KW - photoluminescence

KW - pyrazine

KW - quantum yield

KW - silver

KW - single crystal X-ray diffraction analysis

UR - http://www.scopus.com/inward/record.url?scp=85131764625&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/d25bd5d5-c843-3e83-81ee-675df9080c2c/

U2 - 10.1134/S0022476622030155

DO - 10.1134/S0022476622030155

M3 - Article

AN - SCOPUS:85131764625

VL - 63

SP - 485

EP - 500

JO - Journal of Structural Chemistry

JF - Journal of Structural Chemistry

SN - 0022-4766

IS - 3

ER -