L-valine is a glycogen-type amino acid regarded among the necessary mammalian amino acids.This is an amino acid that is essential for protein synthesis.N-salicylidene-L-valine is gaining a lot of attention because of ...L-valine is a glycogen-type amino acid regarded among the necessary mammalian amino acids.This is an amino acid that is essential for protein synthesis.N-salicylidene-L-valine is gaining a lot of attention because of its unique structure and increased catalytic and cytotoxic activity.We explore the chain of supramolecular dialkyltin N-salicylidene-L-valine complexes 2,3,and 4 to learn more about this structure and its features regarding topological indices.We computed the first and second Randi′c index,harmonic index,sum-connectivity index,atom-bond-connectivity index,geometric arithmetic index and reduced reciprocal Randi′c index of Supramolecular Chain of Different Complexes of N-Salicylidene-L-Valine.Furthermore,we present an analysis of such structures using specific examples,as well as a comparison of topological indices.展开更多
Nowadays,the development of trip let-involved materials becomes a hot research topic in solid-state luminescence fields.However,the mechanism of trip let-involved emission still remains some mysteries to conquer.Here,...Nowadays,the development of trip let-involved materials becomes a hot research topic in solid-state luminescence fields.However,the mechanism of trip let-involved emission still remains some mysteries to conquer.Here,we proposed a new concept of excited-state confo rmation capture for the const ructio ns of different types of trip let-involved materials.Firstly,excited-state conformation could be trapped by supramolecular chains in crystal and fo rm a new optimum excited-state structure which is different from that in solution or simple rigid environment,leading to bright thermally activated delayed fluorescence(TADF) emission.Based on excited-state conformation capture methodology,next,we obtained roomtemperature phosphorescence(RTP) by introducing Br atoms for the enhancement of intersystem crossing.It could be concluded from experime ntal results that TADF may originate from aggregate effect while RTP may derive from monomers.Finally,heavy-atom free RTP and ultra RTP were achieved by eliminating aggregate effect.This wo rk could not only exte nd the design methodology of triplet-involved materials but also set clear evidences for the mechanism of triplet-involved emissions.展开更多
The preparation and crystal structure of complex Co（Hsae）2·2H2O （1, H2sae = N-salicylidene-2-iminoethanol） are reported. X- ray analysis revealed that every six Co（Hsae）2 forms a cyclic chip and every 12 wa...The preparation and crystal structure of complex Co（Hsae）2·2H2O （1, H2sae = N-salicylidene-2-iminoethanol） are reported. X- ray analysis revealed that every six Co（Hsae）2 forms a cyclic chip and every 12 water forms a novel gear-like cluster. Acting as building blocks, the gear-like water cluster and complex chip are connected in A-B fashion and extend into one-dimensional supramolecular chain. Hydrogen bond is the primary bridging force in the formation of supramolecular framework.展开更多
The new ligand 2-（（pyridin-4-ylmethyl）thio）-5-（quinoline-2-yl）-1,3,4-oxadiazole（L） and Ag Cl O4 produced a new coordination polymer： [（Ag2L2Cl O4）ClO 4]n（1）. The complex has been characterized by single-c...The new ligand 2-（（pyridin-4-ylmethyl）thio）-5-（quinoline-2-yl）-1,3,4-oxadiazole（L） and Ag Cl O4 produced a new coordination polymer： [（Ag2L2Cl O4）ClO 4]n（1）. The complex has been characterized by single-crystal X-ray diffraction, IR, TGA, PXRD, UV and elemental analysis. Compound 1 crystallizes in triclinic system, space group P1, with a = 8.4593（5）, b = 14.5903（9）, c = 15.7908（10） A, α = 97.357（5）, β = 99.116（5）, γ = 104.470（5）°, V = 1834.43（20） A3, Dc = 1.91056 g/cm^3, Mr = 1055.38, Z = 2, F（000） = 1048, u = 1.399 mm-1, the final S = 1.002, R = 0.049 and wR = 0.105. The compound consists of a double helix chain. The neighboring chains interact via two kinds of π-π interactions to form a two-dimensional（2D） sheet. Each sheet interacts with the neighboring sheets via π-π interactions to form an extended 3D supramolecular network.展开更多
文摘L-valine is a glycogen-type amino acid regarded among the necessary mammalian amino acids.This is an amino acid that is essential for protein synthesis.N-salicylidene-L-valine is gaining a lot of attention because of its unique structure and increased catalytic and cytotoxic activity.We explore the chain of supramolecular dialkyltin N-salicylidene-L-valine complexes 2,3,and 4 to learn more about this structure and its features regarding topological indices.We computed the first and second Randi′c index,harmonic index,sum-connectivity index,atom-bond-connectivity index,geometric arithmetic index and reduced reciprocal Randi′c index of Supramolecular Chain of Different Complexes of N-Salicylidene-L-Valine.Furthermore,we present an analysis of such structures using specific examples,as well as a comparison of topological indices.
基金This work was supported by the National Natural Science Foundation of China(No.51773077).
文摘Nowadays,the development of trip let-involved materials becomes a hot research topic in solid-state luminescence fields.However,the mechanism of trip let-involved emission still remains some mysteries to conquer.Here,we proposed a new concept of excited-state confo rmation capture for the const ructio ns of different types of trip let-involved materials.Firstly,excited-state conformation could be trapped by supramolecular chains in crystal and fo rm a new optimum excited-state structure which is different from that in solution or simple rigid environment,leading to bright thermally activated delayed fluorescence(TADF) emission.Based on excited-state conformation capture methodology,next,we obtained roomtemperature phosphorescence(RTP) by introducing Br atoms for the enhancement of intersystem crossing.It could be concluded from experime ntal results that TADF may originate from aggregate effect while RTP may derive from monomers.Finally,heavy-atom free RTP and ultra RTP were achieved by eliminating aggregate effect.This wo rk could not only exte nd the design methodology of triplet-involved materials but also set clear evidences for the mechanism of triplet-involved emissions.
基金supported by the Natural Science Foundation of Education Bureau of Liaoning Province,China(No.05L159).
文摘The preparation and crystal structure of complex Co（Hsae）2·2H2O （1, H2sae = N-salicylidene-2-iminoethanol） are reported. X- ray analysis revealed that every six Co（Hsae）2 forms a cyclic chip and every 12 water forms a novel gear-like cluster. Acting as building blocks, the gear-like water cluster and complex chip are connected in A-B fashion and extend into one-dimensional supramolecular chain. Hydrogen bond is the primary bridging force in the formation of supramolecular framework.
基金financially supported by the National Natural Science Foundation of China(No.21201112)
文摘The new ligand 2-（（pyridin-4-ylmethyl）thio）-5-（quinoline-2-yl）-1,3,4-oxadiazole（L） and Ag Cl O4 produced a new coordination polymer： [（Ag2L2Cl O4）ClO 4]n（1）. The complex has been characterized by single-crystal X-ray diffraction, IR, TGA, PXRD, UV and elemental analysis. Compound 1 crystallizes in triclinic system, space group P1, with a = 8.4593（5）, b = 14.5903（9）, c = 15.7908（10） A, α = 97.357（5）, β = 99.116（5）, γ = 104.470（5）°, V = 1834.43（20） A3, Dc = 1.91056 g/cm^3, Mr = 1055.38, Z = 2, F（000） = 1048, u = 1.399 mm-1, the final S = 1.002, R = 0.049 and wR = 0.105. The compound consists of a double helix chain. The neighboring chains interact via two kinds of π-π interactions to form a two-dimensional（2D） sheet. Each sheet interacts with the neighboring sheets via π-π interactions to form an extended 3D supramolecular network.
基金Supported by the Natural Science Foundation of China(21101055)China Postdoctoral Science Foundation(20100470996)+1 种基金Natural Science Foundation of Henan Province(092300410119,102300410093)Foundation of Education Department of Henan Province(2009A150003,2010B150006)
