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1D and 2D Silver-Based Coordination Polymers with Thiomorpholine-4-carbonitrile and Aromatic Polyoxoacids as Coligands: Structure, Photocatalysis, Photoluminescence, and TD-DFT Study
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2020-05-20 , DOI: 10.1021/acs.cgd.0c00287
Predrag Ristić 1 , Tamara R. Todorović 1 , Vladimir Blagojević 2 , Olivera R. Klisurić 3 , Ivana Marjanović 3 , Berta Barta Holló 3 , Predrag Vulić 4 , Mihaela Gulea 5 , Morgan Donnard 6 , Miguel Monge 7 , María Rodríguez-Castillo 7 , José M. López-de-Luzuriaga 7 , Nenad R. Filipović 8
Affiliation  

Four silver-based coordination polymers, {[Ag(L)2](BF4)} (1), {[Ag(H2BTC)(L)]·(H3BTC)} (2), {[Ag2(H2BTEC)(L)2]·3.33H2O} (3), and [Ag(H25SSA)(L)] (4), were synthesized using thiomorpholine-4-carbonitrile (L) as the primary ligand and three aromatic polyoxoacids as coligands: trimesic (H3BTC), pyromellitic (H4BTEC), and 5-sulfosalicylic acid (H35SSA). Compounds 1 and 3 are two-dimensional, while 2 and 4 are one-dimensional. L acts as a bis-monodentate ligand, while the Ag(I) ion is three-coordinated in 2 and four-coordinated in all of the other compounds. The tetrahedral coordination of Ag(I) in 3 leads to an almost complete absence of intermolecular interactions with the metal center. All compounds show reasonable photocatalytic activity for photocatalytic degradation of mordant blue 9 dye, with reaction rates in the 0.036–0.056 min–1 range. Changes in the reaction rates can be correlated with the type and coordination of the coligand. Complex 3 exhibits photoluminescence at 77 K, while 4 exhibits photoluminescence at both room temperature and 77 K. Luminescence lifetimes indicate electronic transitions of singlet parentage, where transitions are allowed. A TD-DFT study determined the contributions of individual singlet–singlet electronic excitations to the fluorescence, indicating that metal– intraligand transitions are responsible for luminescence in both complexes.

中文翻译:

一维和二维基于银的配位聚合物,以硫代吗啉-4-腈和芳族聚氧酸为配体:结构,光催化,光致发光和TD-DFT研究

四种银基配位聚合物{[Ag(L)2 ](BF 4)} 1),{[Ag(H 2 BTC)(L)]·(H 3 BTC)} 2),{使用巯基吗啉-4-腈([ 2 ] )合成了[Ag 2(H 2 BTEC)(L)2 ]·3.33H 2 O} 3)和[Ag(H 2 5SSA)(L)] 4)。 L)作为主要配体,三种芳香族多氧酸作为大分子配体:均苯三酸(H 3 BTC),均苯酸(H 4 BTEC)和5-磺基水杨酸(H3 5SSA)。化合物13是二维的,而化合物24是一维的。L充当双单齿配体,而Ag(I)离子在所有其他化合物中的2和3均是三配位的。Ag(I)在3中的四面体配位导致几乎完全不存在与金属中心的分子间相互作用。所有化合物均显示出对媒染蓝9染料的光催化降解具有合理的光催化活性,反应速率在0.036–0.056 min –1范围内。反应速率的变化可以与大肠菌的类型和配位相关。复杂3在室温和77 K下均显示出7的光致发光,而在室温和77 K下均显示出4的光致发光。发光寿命表明单重态亲本的电子跃迁,允许跃迁。TD-DFT研究确定了单重态-单重态电子激发对荧光的贡献,表明金属-配体之间的跃迁是两种络合物发光的原因。
更新日期:2020-07-01
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