Au(I) and Ag(I) formamidinate tetranuclear complexes and coordination polymers: Synthesis, structures and luminescent properties

Hsu, Wayne; Yang, Xiang-Kai; Chhetri, Pradhumna Mahat; Lin, Shan-Hsiung; Li, Yu-Sian; Chen, Tsun‐Ren; Chen, Jhy‐Der

doi:10.1016/j.ica.2018.07.024

Cited by 7 publications

(9 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The four metal atoms are spanned by four 4-pyf À ligands, with two lying above the mean plane of the four atoms and two below. The Au/Ag-Au/Ag-Au/Ag angles are acute 70.21 (14) and 70.54 (15) , and obtuse 109.63 (13) and 110.3 (2) for 1, which are similar to those reported for [Au 4 (4pyf) 4 ] of 67.24 and 112.76 , for [Au 4 (pmf) 4 ] of 68.59 and 111.40 , and for [Au 4 (4-pyf) 4 ] of 65.29 and 114.71 (Hsu et al, 2018). The N-Au/Ag-N angles of 175.8 (5)-178.9 (4) for 1 indicate a small deviation from linearity.…”

Section: Structural Conformationsupporting

confidence: 84%

“…Free 4-Hpyf shows absorption bands at ca 200-300 nm and shows no observable luminescence (Hsu et al, 2018). The resemblance of the absorption spectra for the formamidinate complex with that of the free ligand suggests that the absorptions arise from ligand n!…”

Section: Luminescence Propertiesmentioning

confidence: 99%

“…Tetranuclear gold(I)-formamidinate complexes have also shown luminescence differences with changes to the substituents of the arene rings. A series of formamidinate complexes based on N,N 0 -bis(pyridin-4-yl)formamidine (4-Hpyf) and bis(pyrimidine)formamidine (pmf) ligands coupled with Au I and Ag I ions have been reported, including the structures of (Hsu et al, 2018). Moreover, the luminescence properties of these complexes formed the focus of a previous report, which showed short lifetimes of 1.06-49.15 ns and we investigated the white luminescence emitted in the solid state.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Luminescence properties and optimized structural conformations of the S₀, S₁ and T₁ states of a tetranuclear formamidinate complex based on Au^I and Ag^I metal ions

Hsu

2019

Acta Crystallogr C

Self Cite

View full text Add to dashboard Cite

N,N′‐Bis(pyridin‐4‐yl)formamidine (4‐pyfH) was reacted with AuI and AgI metal salts to form a novel tetranuclear complex, tetrakis[μ‐N,N′‐bis(pyridin‐4‐yl)formamidinato]digold(I)disilver(I), [Ag2Au2(C11H9N4)2] or [AuxAg4–x(4‐pyf)4] (x = 0–4), 1, which is supported by its metallophilicity. Due to the potential permutation of the coordinated metal ions, six different canonical structures of 1 can be obtained. Complex 1 shows an emission at 501 nm upon excitation at 375 nm in the solid state and an emission at 438 nm upon excitation at 304 nm when dispersed in methanol. Time‐dependent density functional theory (TD‐DFT) calculations confirmed that these emissions can be ascribed to metal‐to‐ligand charge transfer (MLCT) processes. Moreover, the calculations of the optimized structural conformations of the S0 ground state, and the S1 and T1 excited states are discussed and suggest a distorted planar conformation for the tetranuclear Au2Ag2 complex.

show abstract

Section: Structural Conformationsupporting

confidence: 84%

Section: Luminescence Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Luminescence properties and optimized structural conformations of the S₀, S₁ and T₁ states of a tetranuclear formamidinate complex based on Au^I and Ag^I metal ions

Hsu

2019

Acta Crystallogr C

Self Cite

View full text Add to dashboard Cite

show abstract

“…The crystal structure of three complexes, among which silver-(N,N'diphenylpropamidinate) 4, exhibiting a diamond-like arrangement of the four silver atoms, were disclosed by Archibald et al. 16 More recently, other tetranuclear complexes featuring similar diamond-like arrangements of the silver atoms were obtained using formamidinate 21 or 5,5bicyclic amidinates. 22 In order to investigate the relation between the variation of the nuclearity and the silver atoms arrangement in the 1-4 series, and the substituents of the amidinate ligand, Density Functional Theory (DFT) studies were performed.…”

Section: Introductionmentioning

confidence: 99%

Topological Analysis of Ag–Ag and Ag–N Interactions in Silver Amidinate Precursor Complexes of Silver Nanoparticles

et al. 2020

View full text Add to dashboard Cite

A series of silver-amidinate complexes is studied both experimentally and theoretically, in order to investigate the role of the precursor complex in the control of the synthesis of silver nanoparticles via an organometallic route. The replacement of the methyl substituent of the central carbon atom of the amidinate anion by a n-butyl group, allows for the crystallization of a tetranuclear silver-amidinate complex 3 instead of a mixture of di-and trinuclear silver-amidinate complexes 1 and 2, as obtained with a methyl substituent. The relative stabilities and dissociation schemes of various isomeric arrangements of silver atoms in 3 are investigated at the computational DFT level of calculation, depending on the substituents of the amidinate ligand. A tetranuclear silver-amidinate complex 4, exhibiting a diamond-like arrangement of the four silver atoms is also considered. Ag-N bonds and argentophilic Ag-Ag interactions are finely characterized using ELF and QTAIM topological analyses, and compared over the series of the related di, tri and tetranuclear silver-amidinate complexes 1-4. In contrast to the Ag-N dative bonds very similar over the series, argentophilic Ag-Ag interactions of various strengths and covalence degree are characterized for complexes 1-4. This gives insight into the role of the amidinate substituents on the nuclearity and intramolecular chemical bonding of the silver-amidinate precursors, required for the synthesis of dedicated AgNPs with chemically well-defined surfaces.

show abstract

“…Formamidines and related anions can bind transition metals. Recently , formamidines derivatives with Ni (II) [ 68 ] Au (I), Ag (I) [ 69 ] Co (II) [ 70 ] Cu (II) [ 71 ] Pt [ 72 ] and Pd [ 73 ] ions have been synthesized. Amidine functional group has various biological properties, such as anti-virus [ 74 ], anti-AIDS [ 75 ], anti-degenerative [ 76 ], anticancer [ 77 ], anti-platelet [ 78 ] and antimicrobial [ 79 ] activities.…”

Section: Introductionmentioning

confidence: 99%

The synthesis and characterization of Fe2O3@SiO2–SO3H nanofibers as a novel magnetic core-shell catalyst for formamidine and formamide synthesis

Ziyadi

Baghali²,

Heydari

2021

Heliyon

View full text Add to dashboard Cite

Over the past several decades, the fabrication of novel ceramic nanofibers applicable in different areas has been a frequent focus of scientists around the world. Aiming to introduce novel ceramic core-shell nanofibers as a magnetic solid acid catalyst, Fe 2 O 3 @SiO 2 –SO 3 H magnetic nanofibers were prepared in this study using a modification of Fe 2 O 3 @SiO 2 core-shell nanofibers with chlorosulfonic acid to increase the acidic properties of these ceramic nanofibers. The products were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive X-ray spectroscope (EDS), vibrating sample magnetometer (VSM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The prepared nanofibers were used as catalysts in formamide and formamidine synthesis. The treatment of aqueous formic acid using diverse amines with a catalytic amount of Fe 2 O 3 @SiO 2 –SO 3 H nanofibers as a reusable, magnetic and heterogeneous catalyst produced high yields of corresponding formamides at room temperature. Likewise, the reaction of diverse amines with triethyl orthoformate led to the synthesis of formamidine derivatives in excellent yields using this novel catalyst. The catalytic system was able to be recovered and reused at least five times without any catalytic activity loss. Thus, novel core-shell nanofibers can act as efficient solid acid catalysts in different organic reactions capable of being reused several times due to their easy separation by applying magnet.

show abstract

Au(I) and Ag(I) formamidinate tetranuclear complexes and coordination polymers: Synthesis, structures and luminescent properties

Cited by 7 publications

References 31 publications

Luminescence properties and optimized structural conformations of the S₀, S₁ and T₁ states of a tetranuclear formamidinate complex based on Au^I and Ag^I metal ions

Luminescence properties and optimized structural conformations of the S₀, S₁ and T₁ states of a tetranuclear formamidinate complex based on Au^I and Ag^I metal ions

Topological Analysis of Ag–Ag and Ag–N Interactions in Silver Amidinate Precursor Complexes of Silver Nanoparticles

The synthesis and characterization of Fe2O3@SiO2–SO3H nanofibers as a novel magnetic core-shell catalyst for formamidine and formamide synthesis

Contact Info

Product

Resources

About

Au(I) and Ag(I) formamidinate tetranuclear complexes and coordination polymers: Synthesis, structures and luminescent properties

Cited by 7 publications

References 31 publications

Luminescence properties and optimized structural conformations of the S0, S1 and T1 states of a tetranuclear formamidinate complex based on AuI and AgI metal ions

Luminescence properties and optimized structural conformations of the S0, S1 and T1 states of a tetranuclear formamidinate complex based on AuI and AgI metal ions

Topological Analysis of Ag–Ag and Ag–N Interactions in Silver Amidinate Precursor Complexes of Silver Nanoparticles

The synthesis and characterization of Fe2O3@SiO2–SO3H nanofibers as a novel magnetic core-shell catalyst for formamidine and formamide synthesis

Contact Info

Product

Resources

About

Luminescence properties and optimized structural conformations of the S₀, S₁ and T₁ states of a tetranuclear formamidinate complex based on Au^I and Ag^I metal ions

Luminescence properties and optimized structural conformations of the S₀, S₁ and T₁ states of a tetranuclear formamidinate complex based on Au^I and Ag^I metal ions