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Wang Z, Sun YM, Qu QP, Liang YX, Wang XP, Liu QY, Kurmoo M, Su HF, Tung CH, Sun D. Enclosing classical polyoxometallates in silver nanoclusters. NANOSCALE 2019; 11:10927-10931. [PMID: 31139811 DOI: 10.1039/c9nr04045e] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Due to the elusive nature of polyoxometallates (POMs) in the assembly of silver clusters, POMs trapped by silver clusters are usually different from the pristine form, which surely increases the novelty of the assembly results but makes the final structure predictability challenging. Herein, three novel high-nuclearity silver-thiolate clusters trapping two kinds of classical POMs, Lindqvist-Mo6O192- and V10O286-, are reported. They are identified to be [(V10O28)@Ag44] (SD/Ag44a), [(V10O28)@Ag46] (SD/Ag46), and [(Mo6O19)@Ag44] (SD/Ag44b) clusters, which are further extended to 1D chain, 2D sql layer, and 3D pcu framework, respectively. Of note, SD/Ag44b contains a regular cubic Mo6O19 core sealed by an Ag44(EtS)24 shell in a pseudo-sodalite unit and six SCl4 planar squares connecting the respective adjacent silver tetragonal faces. This structure is a novel zeolite closely related to the natural alumino-silicate 'sodalite' but exceptionally made of core-shell silver clusters. Moreover, the Oh symmetric Mo6O192- templates an Oh symmetric Ag44 cluster in SD/Ag44b, realizing authentic symmetry delivery from guest to host in this system. This is a rare silver cluster family with classical POMs encapsulated.
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Liu YN, Su HF, Li YW, Liu QY, Jagličić Z, Wang WG, Tung CH, Sun D. Space Craft-like Octanuclear Co(II)-Silsesquioxane Nanocages: Synthesis, Structure, Magnetic Properties, Solution Behavior, and Catalytic Activity for Hydroboration of Ketones. Inorg Chem 2019; 58:4574-4582. [PMID: 30887809 DOI: 10.1021/acs.inorgchem.9b00137] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Two novel space craft-like octanuclear Co(II)-silsesquioxane nanocages, {Co8[(MeSiO2)4]2(dmpz)8} (SD/Co8a) and {Co8[(PhSiO2)4]2(dmpz)8} (SD/Co8b) (SD = SunDi; Hdmpz = 3,5-dimethylpyrazole), have been constructed from two similar multidentate silsesquioxane ligands assisted with a pyrazole ligand. The Co8 skeleton consists of eight tetrahedral Co(II) ions arranged in a ring and is further capped by two (MeSiO2)4 ligands up and down. The auxiliary dmpz- ligands seal the ring finally. Electrospray ionization mass spectrometry revealed SD/Co8a and SD/Co8b are highly stable in CH2Cl2. Magnetic analysis implies that SD/Co8a announces antiferromagnetic interactions between Co(II) ions. Moreover, both of them display good homogeneous catalytic activity for hydroboration of ketones in the presence of pinacolborane under mild conditions.
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Ji BQ, Su HF, Jagodič M, Jagličić Z, Kurmoo M, Wang XP, Tung CH, Cao ZZ, Sun D. Self-Organization into Preferred Sites by Mg II, Mn II, and Mn III in Brucite-Structured M 19 Cluster. Inorg Chem 2019; 58:3800-3806. [PMID: 30816713 DOI: 10.1021/acs.inorgchem.8b03406] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The search for functional materials, for example those aiming at microelectronics, magnetic recording, and catalysis, often ventures into mixed metal systems to achieve optimization of the properties. Thus, understanding site preference and self-organization is crucial but hard to implement. Herein, we present a system whereby MgII, MnII, and MnIII ions selectively locate exact positions within the Brucite-structured cluster, Mn13Mg6, [MnIII⊂MgII6⊂MnII9MnIII3( L)18(OH)12(N3)6](ClO4)6·12CH3CN, H L = 1-(hydroxymethyl)-3,5-dimethylpyrazolate). The MnIII being small (78 pm) takes up the core position; while 6 MgII (86 pm) are located in the inner ring, and the 9 large MnII (97 pm) and 3 MnIII occupy the outer ring. The factors (a) ionic radii, (b) regularity in coordination geometry, oxophilicity, and softness of MgII compared to MnII, and (c) Jahn-Teller distortion of MnIII may all be implicated synergistically. Electrospray ionization mass spectrometry reveals the M19 disc remains an integral unit when crystals are dissolved, and exchange between Mg and Mn occurs within the disc during its formation. Diamagnetic MgII doping insulates the magnetic exchange between the central MnIII and those in the outer ring, thus giving an overall antiferromagnetic exchange interaction between nearest-neighbors of the outer ring. The work reveals the underlying rule for site-preference of main group metal versus transition metal in disc-like Brucite-structured cluster and provides an elegant new avenue to assemble heterometallic clusters in a stepwise fashion.
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Zhang SS, Alkan F, Su HF, Aikens CM, Tung CH, Sun D. [Ag48(C≡CtBu)20(CrO4)7]: An Atomically Precise Silver Nanocluster Co-protected by Inorganic and Organic Ligands. J Am Chem Soc 2019; 141:4460-4467. [DOI: 10.1021/jacs.9b00703] [Citation(s) in RCA: 108] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Li XY, Su HF, Xu J. A 2D layer network assembled from an open dendritic silver cluster Cl@Ag 11N 24 and an N-donor ligand. Inorg Chem Front 2019. [DOI: 10.1039/c9qi01100e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A 2D layer network was synthesized from an N-donor ligand and a new silver cluster featuring an open dendritic structure with a high coordination ratio of N atom. Both the assembly process and luminescence properties of this complex was studied.
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Zhang SS, Senanayake RD, Zhao QQ, Su HF, Aikens CM, Wang XP, Tung CH, Sun D, Zheng LS. [Au18(dppm)6Cl4]4+: a phosphine-protected gold nanocluster with rich charge states. Dalton Trans 2019; 48:3635-3640. [DOI: 10.1039/c9dt00042a] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A diphosphine-protected 18-gold-atom nanocluster was isolated via a facile reduction of an AuI precursor by NaBH4.
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Chen MM, Su HF, Xie Y, He LF, Lin SC, Zhang ML, Wang C, Xie SY, Huang RB, Zheng LS. Sniffing with mass spectrometry. Sci Bull (Beijing) 2018; 63:1351-1357. [PMID: 36658906 DOI: 10.1016/j.scib.2018.06.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Revised: 06/12/2018] [Accepted: 06/27/2018] [Indexed: 01/21/2023]
Abstract
Gaseous compounds are usually on-line detectable on sensors. The limitations of conventional sensors are suffering from incapability for exactly identifying multiple components as well as incompatibility to possible toxicants in every odor sample. Herein, we discuss an inlet modification to the laboratory standard mass spectrometer, inspired by the sensitive olfactory systems of animals, for direct sniffing, established by connecting a mini pump to the nebulizer gas tubing. The modified mass spectrometry method-sniffing-mass spectrometry (sniffing-MS)-can acquire detailed fingerprint spectra of mixed odors and shows high tolerance to toxicants. Furthermore, the method has a low limit of detection in the order of parts per trillion and is a 'sampling-free' technique for analyzing various gaseous compounds simultaneously, thus offering versatility for smelling daily commodities, tracking diffusion, and locating position of odors. Sniffing-MS can mimic or even surpass the olfaction of animals and is applicable for analyzing gaseous/volatile compounds, especially those polar compounds, in a simple manner depending on the intrinsic molecular mass-to-charge ratio.
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Su YM, Su HF, Wang Z, Li YA, Schein S, Zhao QQ, Wang XP, Tung CH, Sun D, Zheng LS. Three Silver Nests Capped by Thiolate/Phenylphosphonate. Chemistry 2018; 24:15096-15103. [DOI: 10.1002/chem.201803203] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2018] [Indexed: 11/06/2022]
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Wang Z, Su HF, Kurmoo M, Tung CH, Sun D, Zheng LS. Trapping an octahedral Ag 6 kernel in a seven-fold symmetric Ag 56 nanowheel. Nat Commun 2018; 9:2094. [PMID: 29844401 PMCID: PMC5974400 DOI: 10.1038/s41467-018-04499-9] [Citation(s) in RCA: 109] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Accepted: 05/04/2018] [Indexed: 01/30/2023] Open
Abstract
High-nuclearity silver clusters are appealing synthetic targets for their remarkable structures, but most are isolated serendipitously. We report here six giant silver-thiolate clusters mediated by solvents, which not only dictate the formation of an octahedral Ag64+ kernel, but also influence the in situ-generated Mo-based anion templates. The typical sevenfold symmetric silver nanowheels show a hierarchical cluster-in-cluster structure that comprises an outermost Ag56 shell and an inner Ag64+ kernel in the centre with seven MoO42- anion templates around it. Electrospray ionization mass spectrometry analyses reveal the underlying rule for the formation of such unique silver nanowheels. This work establishes a solvent-intervention approach to construct high-nuclearity silver clusters in which both the formation of octahedral Ag64+ kernel and in situ generation of various Mo-based anion templates can be simultaneously controlled.
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Liu JW, Feng L, Su HF, Wang Z, Zhao QQ, Wang XP, Tung CH, Sun D, Zheng LS. Anisotropic Assembly of Ag52 and Ag76 Nanoclusters. J Am Chem Soc 2018; 140:1600-1603. [DOI: 10.1021/jacs.7b12777] [Citation(s) in RCA: 143] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Zhang SS, Su HF, Wang Z, Wang XP, Chen WX, Zhao QQ, Tung CH, Sun D, Zheng LS. Elimination-Fusion Self-Assembly of a Nanometer-Scale 72-Nucleus Silver Cluster Caging a Pair of [EuW10
O36
]9−
Polyoxometalates. Chemistry 2018; 24:1998-2003. [DOI: 10.1002/chem.201705264] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Indexed: 11/08/2022]
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Cheng LP, Wang Z, Wu QY, Su HF, Peng T, Luo GG, Li YA, Sun D, Zheng LS. Small size yet big action: a simple sulfate anion templated a discrete 78-nuclearity silver sulfur nanocluster with a multishell structure. Chem Commun (Camb) 2018; 54:2361-2364. [DOI: 10.1039/c8cc00014j] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A discrete 78-nuclearity Ag nanocluster with a sulfate-centered multishell structure was obtained, indicating that simple anions can induce the formation of high-nuclearity Ag clusters.
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Ji BQ, Jagodič M, Ma HY, Su HF, Li YW, Tung CH, Sun D. Solution behavior and magnetic properties of a novel nonanuclear copper(ii) cluster. NEW J CHEM 2018. [DOI: 10.1039/c8nj04230f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A {Cu9} nanocluster was constructed from a new multidentate pyrazole–alcohol ligand and various small sterically-hindering anions. The ESI-MS was for the first time applied to Cu cluster chemistry to detect the solution behaviour and possible assembly mechanism of the {Cu9} cluster. The cluster also exhibited antiferromagnetic behaviour.
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Liu JW, Su HF, Wang Z, Li YA, Zhao QQ, Wang XP, Tung CH, Sun D, Zheng LS. A giant 90-nucleus silver cluster templated by hetero-anions. Chem Commun (Camb) 2018; 54:4461-4464. [DOI: 10.1039/c8cc01767k] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A giant 90-nucleus silver cluster templated by hetero-anions was isolated and characterized.
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Zhang SS, Su HF, Zhuang GL, Wang XP, Tung CH, Sun D, Zheng LS. A hexadecanuclear silver alkynyl cluster based NbO framework with triple emissions from the visible to near-infrared II region. Chem Commun (Camb) 2018; 54:11905-11908. [DOI: 10.1039/c8cc06683c] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A hexadecanuclear silver alkynyl cluster based NbO framework with triple emissions from visible to near-infrared II region.
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Wang Z, Su HF, Wang XP, Zhao QQ, Tung CH, Sun D, Zheng LS. Johnson Solids: Anion-Templated Silver Thiolate Clusters Capped by Sulfonate. Chemistry 2017; 24:1640-1650. [PMID: 29205568 DOI: 10.1002/chem.201704298] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Indexed: 11/05/2022]
Abstract
Sulfonates were incorporated into six novel high-nuclearity silver(I) thiolate clusters under the guidance of anion templates varied from S2- , SO42- , α-[Mo5 O18 ]6- , β-[Mo5 O18 ]6- , [Mo2 O8 ]4- , to [Mo4 O14 (SO4 )]6- . Single crystal X-ray analysis revealed that SD/Ag1, SD/Ag3, SD/Ag5, and SD/Ag6 are discrete [S@Ag60 ], [α-Mo5 O18 @Ag36 ], [Mo2 O8 @Ag30 ]2 , and [Mo4 O14 (SO4 )@Ag73 ] clusters, respectively, whereas SD/Ag2 and SD/Ag4 are one-dimensional (1D) chains based on the [SO4 @Ag20 ] and [β-Mo5 O18 @Ag36 ] cluster subunits, respectively. Their silver skeletons are protected exteriorly by thiolates and sulfonates and interiorly supported by diverse anions as templates. Structurally, cluster SD/Ag1 is a typical core-shell structure comprised of an inner Ag12 cuboctahedron and an outer Ag48 shell. The sulfate-templated drum-like Ag20 cluster subunits are bridged by PhSO3- to give a 1D chain of SD/Ag2. Complex SD/Ag3 and SD/Ag4 are spindle-like Ag36 clusters with isomeric [Mo5 O18 ]6- inside, and the latter is further extended to a 1D chain through PhSO3- bridges. A pair of [Mo2 O8 ]4- templated gourd-like Ag30 clusters are dimerized in a head-to-head fashion to form SD/Ag5. Complex SD/Ag6 is the largest cluster in this family and doubly templated by unprecedented [Mo4 O14 (SO4 )]6- anions. Geometrically, the silver shells of SD/Ag1-SD/Ag5 show the polyhedral features of Johnson solids, instead of the usual Platonic or Archimedean solids. Solution behaviors and luminescent properties were also investigated in detail.
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Chen H, Shen H, Su H, Chen H, Tan F, Lin J. High-efficiency bioconversion of kitchen garbage to biobutanol using an enzymatic cocktail procedure. BIORESOURCE TECHNOLOGY 2017; 245:1110-1121. [PMID: 28950653 DOI: 10.1016/j.biortech.2017.09.056] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 09/01/2017] [Accepted: 09/04/2017] [Indexed: 06/07/2023]
Abstract
Research on methods to produce biobutanol production from kitchen garbage (KG) as a potential substrate is thus far lacking. Here, the effect of various enzymatic hydrolysis procedures (EHP) was first tested using different enzyme cocktails, on the decomposition of KG. The efficiency of Clostridium acetobutylicum-mediated biobutanol production was then measured using two modes: separate hydrolysis and fermentation (SHF) and simultaneous saccharification fermentation (SSF) in the condition of adjusting pH. The optimal results were obtained using (1) an enzymatic hydrolysis cocktail procedure (EHC5), (2) use of the SSF approach and (3) pH control. This approach results in a biobutanol production of 16.37g/L and total solvent concentration of 32.96g/L. Compared to experiments that use pure glucose asa substrate, our results show that KG is a promising feedstock for biobutanol production. The results demonstrate the feasibility of this waste source for an industrial application via the EHP.
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Wang Z, Su HF, Tan YZ, Schein S, Lin SC, Liu W, Wang SA, Wang WG, Tung CH, Sun D, Zheng LS. Assembly of silver Trigons into a buckyball-like Ag 180 nanocage. Proc Natl Acad Sci U S A 2017; 114:12132-12137. [PMID: 29087328 PMCID: PMC5699068 DOI: 10.1073/pnas.1711972114] [Citation(s) in RCA: 155] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Buckminsterfullerene (C60) represents a perfect combination of geometry and molecular structural chemistry. It has inspired many creative ideas for building fullerene-like nanopolyhedra. These include other fullerenes, virus capsids, polyhedra based on DNA, and synthetic polynuclear metal clusters and cages. Indeed, the regular organization of large numbers of metal atoms into one highly complex structure remains one of the foremost challenges in supramolecular chemistry. Here we describe the design, synthesis, and characterization of a Ag180 nanocage with 180 Ag atoms as 4-valent vertices (V), 360 edges (E), and 182 faces (F)--sixty 3-gons, ninety 4-gons, twelve 5-gons, and twenty 6-gons--in agreement with Euler's rule V - E + F = 2. If each 3-gon (or silver Trigon) were replaced with a carbon atom linked by edges along the 4-gons, the result would be like C60, topologically a truncated icosahedron, an Archimedean solid with icosahedral (Ih) point-group symmetry. If C60 can be described mathematically as a curling up of a 6.6.6 Platonic tiling, the Ag180 cage can be described as a curling up of a 3.4.6.4 Archimedean tiling. High-resolution electrospray ionization mass spectrometry reveals that {Ag3}n subunits coexist with the Ag180 species in the assembly system before the final crystallization of Ag180, suggesting that the silver Trigon is the smallest building block in assembly of the final cage. Thus, we assign the underlying growth mechanism of Ag180 to the Silver-Trigon Assembly Road (STAR), an assembly path that might be further employed to fabricate larger, elegant silver cages.
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Luo GG, Su HF, Xiao A, Wang Z, Zhao Y, Wu QY, Wu JH, Sun D, Zheng LS. Silver-Sulfur Hybrid Supertetrahedral Clusters: The Hitherto Missing Members in the Metal-Chalcogenide Tetrahedral Clusters. Chemistry 2017; 23:14420-14424. [DOI: 10.1002/chem.201703468] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Indexed: 11/08/2022]
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Guo LY, Su HF, Kurmoo M, Tung CH, Sun D, Zheng LS. Core–Shell {Mn7⊂(Mn,Cd)12} Assembled from Core {Mn7} Disc. J Am Chem Soc 2017; 139:14033-14036. [DOI: 10.1021/jacs.7b08679] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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46
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Zhang SS, Wang X, Su HF, Feng L, Wang Z, Ding WQ, Blatov VA, Kurmoo M, Tung CH, Sun D, Zheng LS. A Water-Stable Cl@Ag 14 Cluster Based Metal-Organic Open Framework for Dichromate Trapping and Bacterial Inhibition. Inorg Chem 2017; 56:11891-11899. [PMID: 28933555 DOI: 10.1021/acs.inorgchem.7b01879] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Decoding the principles of cluster-based framework assembly at the molecular level remains a persistent challenge. Herein, we isolated and characterized a novel water-stable three-dimensional (3D) metal-organic open framework [Cl@Ag14(cPrC≡C)10Cl2·(p-TOS)·1/3H2O]n (SD/Ag14, cPrC≡CH = cyclopropylacetylene; p-TOS = p-toluenesulfonate), which contains a chloride-templated Ag14 cluster as building block. For SD/Ag14, one chloride acts as the template to shape the Ag14 cluster and the other bridges the clusters to a 3D pcu-h open framework. As revealed by high resolution electrospray mass spectrometry (HRESI-MS), the Ag12-Ag14 species are potential cluster-based intermediates to the 3D pcu-h framework, which authenticates a preconceived idea that the 3D framework is hierarchically assembled from the silver clusters as observed in solid state. Interestingly, SD/Ag14 can be used effectively to remove the environmental pollutant Cr2O72- from wastewater through anion exchange in a single-crystal-to-single-crystal (SC-SC) transformation fashion. Furthermore, SD/Ag14 exhibits excellent antibacterial activity against Staphylococcus aureus, thus making it a potential antibacterial agent.
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Guo LY, Su HF, Kurmoo M, Wang XP, Zhao QQ, Lin SC, Tung CH, Sun D, Zheng LS. Multifunctional Triple-Decker Inverse 12-Metallacrown-4 Sandwiching Halides. ACS APPLIED MATERIALS & INTERFACES 2017; 9:19980-19987. [PMID: 28537067 DOI: 10.1021/acsami.7b05191] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A family of six triple-decker complexes, {(MX)2[(pz)4]3} (Hpz = 4-nitropyrazole, MX = NaCl, 1; NaBr, 2; NaI, 3; KCl, 4; KBr, 5, and KI, 6), exhibiting inclusion of halides into inverse 12-metallacrown-4 [inv-(12-MCCu(I),pz-4)] array has been realized. Single-crystal X-ray crystallography of each compound reveals a common structural feature consisting of four CuI ions bonded by four pz to form a square metallomacrocycle comprising four metal centers and eight N atoms, thus giving an inv-[12-MCCu(I),pz-4] motif. Two halides are sandwiched by three inv-[12-MCCu(I),pz-4] to form triple-deckers that are further extended in an offset stacking mode by ligand-unsupported cuprophilicity interactions to form a one-dimensional chain structure. Halides are attached to six CuI centers with weak CuI···halogen interaction, resembling anion templates. High-resolution electrospray ionization mass spectrometry reveals that the predominant fragments corresponding to a half of the triple-decker structures of 1-3 exist in solution. Compounds 4, 5, and 6 showed excellent electrocatalytic activities toward the reduction of nitrite and can also be used as selective "turn-off" sensors for Ag(I) in water. The present results will be helpful for the future design and synthesis of functional inverse metallacrowns and their multiple-decker complexes.
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Su H, Lin J, Wang Y, Chen Q, Wang G, Tan F. Engineering Brevibacterium flavum
for the production of renewable bioenergy: C4-C5 advanced alcohols. Biotechnol Bioeng 2017; 114:1946-1958. [DOI: 10.1002/bit.26324] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 04/18/2017] [Accepted: 04/26/2017] [Indexed: 12/30/2022]
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Li XY, Su HF, Kurmoo M, Tung CH, Sun D, Zheng LS. Structure, solution assembly, and electroconductivity of nanosized argento-organic-cluster/framework templated by chromate. NANOSCALE 2017; 9:5305-5314. [PMID: 28398432 DOI: 10.1039/c7nr00732a] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In view of elucidating potential structures and assembly mechanism of silver clusters and silver cluster-based metal-organic frameworks, we prepared four argento-organic-clusters/frameworks where the structures were directed by chromate in the presence of different thiolates. All four structures with tBuC6H4S-, SiBu-, and SiPr- consist of three core-shells, an inner CrO42-, an intermediate Ag-S aggregate and finally the protective organic moieties. {(HNEt3)3[Ag(CrO4)4@Ag46(SC6H4tBu)24(CF3COO)18(DMF)4]} (1) is a supertetrahedron with an inner Ag(CrO4)4 tetrahedron shelled by four fused Ag11.5S6 lobes. [(CrO4)5@Ag40(SiBu)27(CF3COO)3]n (2) is an undulated snake-like tube housing the infinite CrO42- tetrahedra. [(CrO4)2@Ag41(SiBu)30(NO3)3(CN)4]n (3) forms an uncommon 7-connected kwh network incorporating hexagonal layers of Ag19(SiBu)15 balls with a single inner CrO42- connected by another Ag atom. Both enantiomeric chiral qtz frameworks of [CrO4@Ag20(SiPr)10(Cr2O7)2(COOCF3)4(DMF)4]n (4) were structurally characterized. In 4, Cr2O72- connects the Ag20(SiPr)10 clusters with a trapped CrO42- into a 3D quartz (qtz) structure, where the spherical cluster acts like oxygen and Cr2O72- takes the place of Si in SiO2. Electrospray ionization mass spectrometry (ESI-MS) analysis of the reaction solutions of 1-4 clearly indicated that (i) the Ag(CrO4)4@Ag46 core of 1 can retain its molecular structure in the solution and (ii) the chromate-templated polynuclear silver-thiolate species in solution are important building blocks to construct the 1D or 3D motif for 2-4. The electrochemistry in sulfuric acid and enhancement of the electrical conductivity upon I2 doping have also been reported.
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Li XY, Wang Z, Su HF, Feng S, Kurmoo M, Tung CH, Sun D, Zheng LS. Anion-templated nanosized silver clusters protected by mixed thiolate and diphosphine. NANOSCALE 2017; 9:3601-3608. [PMID: 28247882 DOI: 10.1039/c6nr09632h] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
S2-, MoO42-, and Mo6O228- were successfully employed as templates in the formation of six high-symmetry polynuclear silver clusters as exemplified in the single-crystal X-ray structures of [S@Ag18(tBuC6H4S)16(dppp)4]·DMF·5CH3CN·3CH3OH (1), [MoO4@Ag24(MeC6H4S)12(dppm)6(MoO4)4]·2BF4·C2H5NO (2), [MoO4@Ag24(MeC6H4S)12(dppm)6(MoO4)4]·2CF3SO3 (3), [MoO4@Ag24(MeC6H4S)12(dppf)6(MoO4)4]·2CF3SO3 (4), [MoO4@Ag24(MeC6H4S)12(dppb)6(MoO4)4]·2CF3SO3 (5) and [Mo6O22@Ag46(tBuC6H4S)32(dppm)4(CH3CN)8]·6CF3SO3 (6) (dppp = 1,3-bis(diphenylphosphino)propane, dppm = bis(diphenylphosphino)methane, dppf = 1,1'-bis(diphenylphosphino)ferrocene and dppb = 1,4-bis(diphenylphosphino)butane). Cluster 1 is a S2--centered octadecanuclear banana-shaped molecule. Clusters 2-5 have similar structures consisting of a tetrahedron of a MoO42- core and four MoO42- where three silver atoms cap each face and a pair sits on each edge, giving tetraicosanuclear ball-shaped molecules. Although different diphosphine ligands and silver salts were used in the syntheses, 2-5 contain a common building cluster unit with similar geometry and nuclearity. With (Bu4N)2Mo6O19 as a template, a giant 46-silver-atom cluster encapsulates an in situ modified Mo6O228- unit. The nuclearity and geometry depend on the size and shape of the templates. High-resolution electrospray mass spectrometry (HR-ESI-MS) analyses of 4 indicate its exceptionally high stability in acetonitrile. The solid-state luminescence of 1 as a function of the temperature exhibits thermochromism from red to yellow due to the different intensities of the two bands. This work established a new strategy for the construction of polynuclear silver clusters using an anionic template and mixed S- and P-donor ligands where a promising approach for building novel dual emissive materials is unraveled.
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