1
|
Dunatov M, Molčanov K, Štefanić Z, Kruk R, Androš Dubraja L. Interfacial Water Molecules as Agents for Phase Change Control and Proton Conductivity Enhancement in the Ammonium Vanadyl Tartrate System. Inorg Chem 2024; 63:163-172. [PMID: 38100051 DOI: 10.1021/acs.inorgchem.3c02605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2024]
Abstract
This study demonstrates the reversible structural transformation, single-crystal-to-single-crystal, of the ammonium vanadyl (L-tartrate) complex salt from the hydrate phase to the anhydrous phase. The transformation can be initiated by stimuli, such as temperature, humidity, or vacuum conditions. The hydrate and anhydrous phases exhibit a tetragonal structure (P41212), with marked differences in hydrogen bonding due to the presence or absence of one water molecule per asymmetric unit. The intricate relationship between crystal packing and intermolecular interactions in the hydrate phase was investigated by crystallographic charge density analysis revealing, at the molecular level, the reasons for the observed 5 orders of magnitude higher proton conductivity of the hydrate phase compared to that of the anhydrous phase. To gain further insight into the processes occurring at the surfaces of grain boundaries and the proton transfer mechanisms in this system, rehydration of the complex salt was carried out by using D2O instead of H2O and monitored by in situ ATR-FTIR spectroscopy. The results highlight the critical role of interfacial water molecules in driving structural transformations and influencing proton conductivity.
Collapse
Affiliation(s)
- Marko Dunatov
- Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | | | - Zoran Štefanić
- Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Robert Kruk
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | | |
Collapse
|
2
|
Liu S, He Y, Ma X, Liu J, Ma P, Wang J, Niu J. Synthesis and Structure of High-Nuclearity Carboxylate-Modified Heteropolyoxovanadate Serving as a Heterogeneous Catalyst for Selective Oxidation of Alkylbenzenes. Inorg Chem 2023; 62:18384-18390. [PMID: 37906517 DOI: 10.1021/acs.inorgchem.3c01802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2023]
Abstract
A high-nuclearity carboxylic-modified heteropolyoxovanadate, Na2K10H15[P8VIV24(tart)15(H2O)15(OH)O51]·58H2O [1, tart = C4H2O6], has been successfully synthesized by a conventional aqueous method under mild conditions. The crystallographic study reveals that compound 1 crystallizes in the tetragonal I41/a space group and is composed by a trilayer saddle-like polyoxoanion {P8V24}. Two {V3(tart)(H2O)O11} as linking units bridge the top {P4VIV9(tart)7(H2O)4(OH)O23} and the bottom {P4VIV9(tart)6(H2O)9O22} layers via tartrate ligands and {PO4} tetrahedra, resulting in a 24-nuclearity POV skeleton structure. More interestingly, compound 1 serves as a heterogeneous catalyst for the selective oxidation of diphenylmethanes with 96.2% conversion and 93.6% selectivity under the optimized conditions.
Collapse
Affiliation(s)
- Siyu Liu
- Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Molecular Sciences, Henan University, Kaifeng 475004, Henan, P. R. China
| | - Yuzan He
- Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Molecular Sciences, Henan University, Kaifeng 475004, Henan, P. R. China
| | - Xinyi Ma
- Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Molecular Sciences, Henan University, Kaifeng 475004, Henan, P. R. China
| | - Jiayu Liu
- Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Molecular Sciences, Henan University, Kaifeng 475004, Henan, P. R. China
| | - Pengtao Ma
- Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Molecular Sciences, Henan University, Kaifeng 475004, Henan, P. R. China
| | - Jingping Wang
- Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Molecular Sciences, Henan University, Kaifeng 475004, Henan, P. R. China
| | - Jingyang Niu
- Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Molecular Sciences, Henan University, Kaifeng 475004, Henan, P. R. China
| |
Collapse
|
3
|
Theoretical insight on the importance of CH···O and NH···O interactions in the crystal packing of a decavanadate synthesized from a simple V(IV) precursor. Inorganica Chim Acta 2023. [DOI: 10.1016/j.ica.2023.121411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
|
4
|
Li SM, Ping QD, Liu XM, Wang JL, Li JN, Zang TT, Mei H, Xu Y. Exceptional structure flexibility and adaptive catalytic desulfurization of a cyclic decanuclear polyoxoalkoxyvanadate (Ⅲ). J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
5
|
Xu X, He Y, Meng W, Yao L, Liu L, Xu F, Zhao C. Chiral Wheel Anions of Copper(II)-Early Lanthanides(III) with High Optical-Limiting Properties. Dalton Trans 2022; 51:5414-5418. [DOI: 10.1039/d2dt00117a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new family of chiral wheel anions {CuII22LnIII4} (La, Ce, Pr, Nd and Sm) was obtained from aqueous solution by the use of tartrate anions. It provides a new perspective...
Collapse
|
6
|
Thakur S, Frontera A, Chattopadhyay S. An insight into the supramolecular interactions in two linear polyvanadates. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
7
|
Wang J, Liu X, Du Z, Xu Y. Organo-functionalized polyoxovanadates: crystal architecture and property aspects. Dalton Trans 2021; 50:7871-7886. [PMID: 34008655 DOI: 10.1039/d1dt00494h] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Polyoxovanadates (POVs), as one of the most prominent members of polyoxometalates (POMs), have been subject to extensive studies by virtue of their aesthetically intriguing structures and potential applications in catalysis, magnetism, and optics, among others. In recent years, organo-functionalized POVs have received considerable attention due to the combination of the advantages of POVs with the importance of organic species. In this review, the key developments of polyoxovanadates and, particularly, the achievements that are related to polyoxovanadates modified with organic ligands and transition metal-organic ligand are summarized. Herein, we systematically introduce the structural features of organo-functionalized POVs and their main applications involved in the magnetism and catalysis aspects. Finally, the current challenges and future prospects in the design, synthesis, and property investigation of polyoxovanadates are also discussed.
Collapse
Affiliation(s)
- Jilei Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing 210009, P.R. China.
| | - Xiaomei Liu
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing 210009, P.R. China.
| | - Zeyu Du
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing 210009, P.R. China.
| | - Yan Xu
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing 210009, P.R. China.
| |
Collapse
|
8
|
Kang RK, Dong YY, Cao JP, Luo XM, Du ZY, Zhu D, Xu Y. An Unprecedented Bird Nest Molybdenum(V) Cobalto-Phosphate Nanosized Wheel Constructed from the [H 55 (Mo 24 O 48 )(Co 4 O) 2 Co 16 (PO 4 ) 42 (py) 6 (EtOH) 2 (H 2 O) 11 ] 3- Anion. Chemistry 2021; 27:1301-1305. [PMID: 32915481 DOI: 10.1002/chem.202004083] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Indexed: 01/06/2023]
Abstract
An unprecedented bird-nest high-nuclear molybdenum(V) cobalto-phosphate nanosized wheel modified by imidazole (im) and pyridine (py), {[H55 (Mo24 O48 )(Co4 O)2 Co16 (PO4 )42 (py)6 (EtOH)2 (H2 O)11 ]- @[(Him)2 (Hpy)]}(N-Et-py)(H2 PO4 )(py)7 (EtOH)⋅12 H2 O (1), has been successfully synthesized by self-assembly. The anionic huge wheel consists of two rare {Co4 O} squares, four {Co4 } tetramers, four {Mo4 } tetramers and four {Mo2 } dimers, linked by bridging oxygen atoms and [PO4 ] groups and encloses two imidazolium cations and a protonated pyridium for charge balance. Surprisingly, 1 represents the first twisted wheel-shaped cluster with a record high-nuclear molybdenum(V) cobalto-phosphate. The delocalized electron effects of the cluster are enhanced with the help of coordinated py ligands, which endows 1 with an excellent third-order nonlinear optical (NLO) response. Additionally, 1 also shows a better photocatalytic water oxidation activity than Co(NO3 )2 with the O2 production of 205 μmol during 6 h in the absence of the [Ru(bpy)3 ]2+ photosensitizer.
Collapse
Affiliation(s)
- Run-Kun Kang
- College of Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, 210009, P. R. China
| | - Ya-Yu Dong
- College of Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, 210009, P. R. China
| | - Jia-Peng Cao
- College of Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, 210009, P. R. China
| | - Xi-Ming Luo
- College of Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, 210009, P. R. China
| | - Ze-Yu Du
- College of Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, 210009, P. R. China
| | - Dunru Zhu
- College of Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, 210009, P. R. China
| | - Yan Xu
- College of Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, 210009, P. R. China
| |
Collapse
|
9
|
Zang TT, Cao JP, Du ZY, Mei H, Xu Y. Two new Schiff-base modified vanadium complexes with third-order NLO properties. J COORD CHEM 2020. [DOI: 10.1080/00958972.2020.1827144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Ting-Ting Zang
- College of Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, P. R. China
| | - Jia-Peng Cao
- College of Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, P. R. China
| | - Ze-Yu Du
- College of Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, P. R. China
| | - Hua Mei
- College of Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, P. R. China
| | - Yan Xu
- College of Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, P. R. China
| |
Collapse
|
10
|
Yang MX, Zhou MJ, Cao JP, Han YM, Hong YL, Xu Y. Application of temperature-controlled chiral hybrid structures constructed from copper(ii)-monosubstituted Keggin polyoxoanions and copper(ii)-organoamine complexes in enantioselective sensing of tartaric acid. RSC Adv 2020; 10:13759-13765. [PMID: 35492985 PMCID: PMC9051601 DOI: 10.1039/d0ra01904f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Accepted: 03/25/2020] [Indexed: 11/21/2022] Open
Abstract
Temperature usually occupies a crucial position in the construction of chiral compounds. By controlling the temperature of the reaction system, chiral and non-chiral compounds can be designed and synthesized. Given the above, three new chiral and non-chiral compounds based on copper(ii) monosubstituted polyoxoanions and Cu(en) complexes (en = ethylenediamine), d/l-[Cu(H2O)(en)2]2{[Cu(H2O)2(en)][SiCuW11O39]}·5H2O (1, d-1 and l-1) and [Cu(H2O)(en)2]{[Cu(en)2]2[SiCuW11O39]}·2.5H2O (2), were successfully synthesized under hydrothermal conditions. The main synthesis conditions of compound 1 (d-1 and l-1) and compound 2 are the same, however, the only difference is that the reaction temperatures are 80 °C and 140 °C, respectively. What's more, compounds 1 and 2 can form a 1D chiral chain by Cu–O and W/Cu–O–W/Cu bonds, respectively, and further obtain a 3D-supramolecular framework through hydrogen bonding interaction. Meanwhile, due to the asymmetry of chiral compound 1, optical second-harmonic generation (SHG) was used to investigate the second-order nonlinear optical effect and it was found that the observed SHG efficiency of compound 1 is 0.3 times that of urea. To further investigate the chiral properties, d-1 and l-1 were used in the electrochemical enantioselective sensing of d-/l-tartaric acid (d-/l-tart) molecules, respectively, which demonstrates that d-1 and l-1 have a good application prospect in sensing chiral substances. A pair of temperature-controlled chiral compounds, d- and l-[Cu(en)2(H2O)]2{[Cu(en)(H2O)2][SiCuW11O39]}·5H2O (en = ethanediamine) are isolated by hydrothermal method, having a good application prospect in sensing d-/l-tartaric acid.![]()
Collapse
Affiliation(s)
- Mu-Xiu Yang
- College of Chemical Engineering
- State Key Laboratory of Materials-Oriented Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- P. R. China
| | - Meng-Jie Zhou
- College of Chemical Engineering
- State Key Laboratory of Materials-Oriented Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- P. R. China
| | - Jia-Peng Cao
- College of Chemical Engineering
- State Key Laboratory of Materials-Oriented Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- P. R. China
| | - Ye-Min Han
- College of Chemical Engineering
- State Key Laboratory of Materials-Oriented Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- P. R. China
| | - Ya-Lin Hong
- College of Chemical Engineering
- State Key Laboratory of Materials-Oriented Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- P. R. China
| | - Yan Xu
- College of Chemical Engineering
- State Key Laboratory of Materials-Oriented Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- P. R. China
| |
Collapse
|
11
|
Huang B, Xiao Z, Wang Y, Ke D, Zhu C, Zhang S, H u X, Wu P. Destroy the inherent symmetry of vanadium-based inorganic cluster through chiral organic ligand: Synthesis and characterization of a polyoxovanadate-derived amino acid ester hybrid. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.05.114] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
12
|
Cao JP, Xue YS, Hu ZB, Luo XM, Cui CH, Song Y, Xu Y. Exploring the Magnetic Interaction of Asymmetric Structures Based on Chiral VIII8 Clusters. Inorg Chem 2019; 58:2645-2651. [DOI: 10.1021/acs.inorgchem.8b03220] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Jia-Peng Cao
- College of Chemical Engineering, State Key Laboratory of Materials-oriented Chemical Engineering, Nanjing Tech University, Nanjing, 210009, China
| | - Yun-Shan Xue
- College of Chemical Engineering, State Key Laboratory of Materials-oriented Chemical Engineering, Nanjing Tech University, Nanjing, 210009, China
| | - Zhao-Bo Hu
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Xi-Ming Luo
- College of Chemical Engineering, State Key Laboratory of Materials-oriented Chemical Engineering, Nanjing Tech University, Nanjing, 210009, China
| | - Chen-Hui Cui
- College of Chemical Engineering, State Key Laboratory of Materials-oriented Chemical Engineering, Nanjing Tech University, Nanjing, 210009, China
| | - You Song
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Yan Xu
- College of Chemical Engineering, State Key Laboratory of Materials-oriented Chemical Engineering, Nanjing Tech University, Nanjing, 210009, China
| |
Collapse
|
13
|
Zechel F, Schwendt P, Gyepes R, Šimunek J, Tatiersky J, Krivosudský L. Vanadium( v) complexes of mandelic acid. NEW J CHEM 2019. [DOI: 10.1039/c9nj02275a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Di- and trinuclear complexes of vanadium(v) and mandelic acid were prepared revealing surprising geometry of the trinuclear species.
Collapse
Affiliation(s)
- Filip Zechel
- Department of Inorganic Chemistry
- Faculty of Natural Sciences
- Comenius University in Bratislava
- Mlynská dolina
- 842 15 Bratislava
| | - Peter Schwendt
- Department of Inorganic Chemistry
- Faculty of Natural Sciences
- Comenius University in Bratislava
- Mlynská dolina
- 842 15 Bratislava
| | - Róbert Gyepes
- Department of Inorganic Chemistry
- Faculty of Science
- Charles University
- 128 00 Praha
- Czech Republic
| | - Ján Šimunek
- Department of Inorganic Chemistry
- Faculty of Natural Sciences
- Comenius University in Bratislava
- Mlynská dolina
- 842 15 Bratislava
| | - Jozef Tatiersky
- Department of Inorganic Chemistry
- Faculty of Natural Sciences
- Comenius University in Bratislava
- Mlynská dolina
- 842 15 Bratislava
| | - Lukáš Krivosudský
- Department of Inorganic Chemistry
- Faculty of Natural Sciences
- Comenius University in Bratislava
- Mlynská dolina
- 842 15 Bratislava
| |
Collapse
|
14
|
|
15
|
Cao JP, Cui CH, Luo XM, Li NF, Xu Y, Xu Y. Polyoxovanadatogermanates-based photoelectric bifunctional materials: The ratio of V12Ge8 and V24Ge16 controlled by solvent. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.09.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
|
16
|
Luo XM, Chen L, Dong YY, Li J, Cui CH, Cao JP, Xu Y. Three new high-nuclear transition-metal-substituted heteropolytungstates: syntheses, crystal structures, magnetic studies and NLO properties. Dalton Trans 2018; 47:9504-9511. [PMID: 29963671 DOI: 10.1039/c8dt01613e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Three new nickel-cluster-substituted polyoxometalates (POMs), [Ni6(H2O)9(μ3-OH)3(HSiW9O34)]2·12H2O (1), [Ni(en)(H2O)3][Ni6(H2O)3(en)2L(μ3-OH)3(HSiW9O34)]2·9H2O (2) (en = ethylenediamine; L = C7H5O2 = benzoic acid) and [Ni6(L')6(CH3COO)(H2O)3(μ3-OH)3(HPW9O34)]2·9H2O (3) (L' = C5NH5 = pyridine) were successfully isolated under hydro-/solvothermal conditions. 1-3 were structurally characterized by single-crystal XRD, elemental analyses, PXRD, IR, and TGA. Compound 1 mainly consists of a pair of {Ni6SiW9} fragments and some water molecules. Interestingly, the whole structure can be regarded as the connection of {Ni6SiW9} and another unit rotated 180° through Ni-O-W bonds, forming a dimeric structure {Ni6SiW9}2. Compounds 2 and 3 also have an {Ni6XW9}2 (X = Si, P) dimer, but there is a big difference in the connection between {Ni6SiW9} units. On this basis, mono-dentate conjugated organic ligands (benzoic acid (L) and pyridine (L')) were successfully introduced. It is noteworthy that pyridine molecules were first integrated into {Ni6SiW9}-based clusters and 3 features the highest number of organic ligands (six pyridines per Ni6) in the reported {Ni6XW9}-based clusters. The introduction of organic ligands to compounds 2 and 3 can bring about better third-order nonlinear optical properties. Magnetic research indicated the existence of ferromagnetic interactions in 2-3.
Collapse
Affiliation(s)
- Xi-Ming Luo
- College of Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, P. R. China.
| | | | | | | | | | | | | |
Collapse
|