{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,14]],"date-time":"2026-01-14T01:23:15Z","timestamp":1768353795306,"version":"3.49.0"},"reference-count":37,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2021,6,30]],"date-time":"2021-06-30T00:00:00Z","timestamp":1625011200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100008530","name":"European Regional Development Fund","doi-asserted-by":"publisher","award":["VEKOP-2.3.2-16-2017-00013"],"award-info":[{"award-number":["VEKOP-2.3.2-16-2017-00013"]}],"id":[{"id":"10.13039\/501100008530","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100005881","name":"Emberi Eroforr\u00e1sok Miniszt\u00e9riuma","doi-asserted-by":"publisher","award":["\u00daNKP-18-4-BME-238"],"award-info":[{"award-number":["\u00daNKP-18-4-BME-238"]}],"id":[{"id":"10.13039\/501100005881","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100005881","name":"Emberi Eroforr\u00e1sok Miniszt\u00e9riuma","doi-asserted-by":"publisher","award":["BME FIKP-NAT"],"award-info":[{"award-number":["BME FIKP-NAT"]}],"id":[{"id":"10.13039\/501100005881","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004564","name":"Ministarstvo Prosvete, Nauke i Tehnolo\u0161kog Razvoja","doi-asserted-by":"publisher","award":["451-03-68\/2021-14\/200125"],"award-info":[{"award-number":["451-03-68\/2021-14\/200125"]}],"id":[{"id":"10.13039\/501100004564","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>An aerial humidity-induced solid-phase hydrolytic transformation of the [Zn(NH3)4]MoO4@2H2O (compound 1@2H2O) with the formation of [(NH4)xH(1\u2212x)Zn(OH)(MoO4)]n (x = 0.92\u20130.94) coordination polymer (formally NH4Zn(OH)MoO4, compound 2) is described. Based on the isostructural relationship, the powder XRD indicates that the crystal lattice of compound 1@2H2O contains a hydrogen-bonded network of tetraamminezinc (2+) and molybdate (2\u2212) ions, and there are cavities (O4N4(\u03bc-H12) cube) occupied by the two water molecules, which stabilize the crystal structure. Several observations indicate that the water molecules have no fixed positions in the lattice voids; instead, the cavity provides a neighborhood similar to those in clathrates. The @ symbol in the notation is intended to emphasize that the H2O in this compound is enclathrated rather than being water of crystallization. Yet, signs of temperature-dependent dynamic interactions with the wall of the cages can be detected, and 1@2H2O easily releases its water content even on standing and yields compound 2. Surprisingly, hydrolysis products of 1 were observed even in the absence of aerial humidity, which suggests a unique solid-phase quasi-intramolecular hydrolysis. A mechanism involving successive substitution of the ammonia ligands by water molecules and ammonia release is proposed. An ESR study of the Cu-doped compound 2 (2#dotCu) showed that this complex consists of two different Cu2+(Zn2+) environments in the polymeric structure. Thermal decomposition of compounds 1 and 2 results in ZnMoO4 with similar specific surface area and morphology. The ZnMoO4 samples prepared from compounds 1 and 2 and compound 2 in itself are active photocatalysts in the degradation of Congo Red dye. IR, Raman, and UV studies on compounds 1@2H2O and 2 are discussed in detail.<\/jats:p>","DOI":"10.3390\/molecules26134022","type":"journal-article","created":{"date-parts":[[2021,7,1]],"date-time":"2021-07-01T02:44:39Z","timestamp":1625107479000},"page":"4022","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Solid-Phase \u201cSelf-Hydrolysis\u201d of [Zn(NH3)4MoO4@2H2O] Involving Enclathrated Water\u2014An Easy Route to a Layered Basic Ammonium Zinc Molybdate Coordination Polymer"],"prefix":"10.3390","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4257-0581","authenticated-orcid":false,"given":"Kende Attila","family":"B\u00e9res","sequence":"first","affiliation":[{"name":"Research Centre for Natural Sciences, Magyar Tud\u00f3sok Krt 2, 1117 Budapest, Hungary"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Istv\u00e1n E.","family":"Saj\u00f3","sequence":"additional","affiliation":[{"name":"Szentagothai Research Centre, Environmental Analytical and Geoanalytical Research Group, University of P\u00e9cs, Ifj\u00fas\u00e1g \u00datja 20, 7624 P\u00e9cs, Hungary"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gy\u00f6rgy","family":"Lendvay","sequence":"additional","affiliation":[{"name":"Research Centre for Natural Sciences, Magyar Tud\u00f3sok Krt 2, 1117 Budapest, Hungary"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3960-1829","authenticated-orcid":false,"given":"L\u00e1szl\u00f3","family":"Trif","sequence":"additional","affiliation":[{"name":"Research Centre for Natural Sciences, Magyar Tud\u00f3sok Krt 2, 1117 Budapest, Hungary"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4796-4929","authenticated-orcid":false,"given":"Vladimir M.","family":"Petru\u0161evski","sequence":"additional","affiliation":[{"name":"Faculty of Natural Sciences and Mathematics, Ss. Cyryl and Methodius University, 1000 Skopje, North Macedonia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Berta","family":"Barta-Holl\u00f3","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovica 3, 21000 Novi Sad, Serbia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"L\u00e1szl\u00f3","family":"Korecz","sequence":"additional","affiliation":[{"name":"Research Centre for Natural Sciences, Magyar Tud\u00f3sok Krt 2, 1117 Budapest, Hungary"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fernanda Paiva","family":"Franguelli","sequence":"additional","affiliation":[{"name":"Research Centre for Natural Sciences, Magyar Tud\u00f3sok Krt 2, 1117 Budapest, Hungary"},{"name":"Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, M\u0171egyetem Rakpart 3, 1111 Budapest, Hungary"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4499-3983","authenticated-orcid":false,"given":"Krisztina","family":"L\u00e1szl\u00f3","sequence":"additional","affiliation":[{"name":"Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, M\u0171egyetem Rakpart 3, 1111 Budapest, Hungary"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5938-8543","authenticated-orcid":false,"given":"Imre Mikl\u00f3s","family":"Szil\u00e1gyi","sequence":"additional","affiliation":[{"name":"Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, M\u0171egyetem Rakpart 3, 1111 Budapest, Hungary"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"L\u00e1szl\u00f3","family":"K\u00f3tai","sequence":"additional","affiliation":[{"name":"Research Centre for Natural Sciences, Magyar Tud\u00f3sok Krt 2, 1117 Budapest, Hungary"},{"name":"Deuton-X Ltd., Selmeci u. 89, 2030 \u00c9rd, Hungary"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,6,30]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"13679","DOI":"10.1021\/acs.inorgchem.8b02261","article-title":"Unexpected Sequential NH3\/H2O Solid\/Gas Phase Ligand Exchange and Quasi-Intramolecular Self-Protonation Yield [NH4Cu(OH)MoO4], a Photocatalyst Misidentified before as (NH4)2Cu(MoO4)2","volume":"57","author":"Bakos","year":"2018","journal-title":"Inorg. Chem."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"836","DOI":"10.1021\/cm950427i","article-title":"Chimie Douce Synthesis of a Layered Ammonium Zinc Molybdate","volume":"8","author":"Levin","year":"1996","journal-title":"Chem. Mater."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"100331","DOI":"10.1016\/j.mtchem.2020.100331","article-title":"Enhanced photocatalytic degradation of nitrobenzene using MWCNT\/\u03b2ZnMoO4 composites under UV light emitting diodes (LEDs)","volume":"17","author":"Natarajan","year":"2020","journal-title":"Mater. Today Chem."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"207","DOI":"10.1016\/j.jtice.2013.05.007","article-title":"Hydrothermal synthesis of \u03b2-ZnMoO4 crystals and their photocatalytic degradation of Victoria Blue R and phenol","volume":"45","author":"Jiang","year":"2014","journal-title":"J. Taiwan Inst. Chem. Eng."},{"key":"ref_5","unstructured":"Johannessen, T., Sorensen, R.Z., Christensen, C.H., Hvid, G., Quaade, U., and Norskov, J.K. (2010, November 25). Method and device for safe and controlled delivery of ammonia from a solid ammonia storage medium. PCT Int. Appl. DK2006\/000385. Available online: https:\/\/patentimages.storage.googleapis.com\/b7\/f6\/f1\/2b8eec5d7314a6\/US20100293927A1.pdf."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"198","DOI":"10.1016\/j.jssc.2009.10.011","article-title":"Comparative study of the synthesis of layered transition metal molybdates","volume":"183","author":"Mitchell","year":"2010","journal-title":"J. Solid State Chem."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"57","DOI":"10.1016\/S0022-4596(78)90183-4","article-title":"Etude en spectrocopie infrarouge de molybdates non-stoechiometriques","volume":"24","author":"Peltre","year":"1978","journal-title":"J. Solid State Chem."},{"key":"ref_8","first-page":"549","article-title":"Probl\u00e8mes de non-st\u0153chiom\u00e9trie dans certains molybdates hydrat\u00e9s de zinc, cobalt et nickel","volume":"90","year":"1967","journal-title":"Bull. Soc. Fr. Min\u00e9ral. Cristallogr."},{"key":"ref_9","unstructured":"Zelikman, A.N., Kalinina, I.G., Myakisheva, L.V., and Egorov, B.L. (1978). Synthesis and properties of tetraamminezincomolybdate. Izv. Vyssh. Ucheb. Zav. Tsvetn. Metall., 71\u201375."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"296","DOI":"10.1002\/hlca.19340170134","article-title":"\u00dcber Ammoniakate von Chromaten und von Perchloraten","volume":"17","author":"Ephraim","year":"1934","journal-title":"Helv. Chim. Acta"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1646","DOI":"10.1002\/hlca.200890180","article-title":"Studies on the Chemistry of Tetraamminezinc(II) Dipermanganate ([Zn(NH3)4](MnO4)2): Low-Temperature Synthesis of the Manganese Zinc Oxide (ZnMn2O4) Catalyst Precursor","volume":"91","author":"Keresztury","year":"2008","journal-title":"Helv. Chim. Acta"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1163","DOI":"10.1515\/znb-1994-0902","article-title":"Kristallstruktur und Schwingungsspektren von Zn(NH3)4(ClO4)2\/Crystal Structure and Vibrational Spectra of Zn(NH3)4(ClO4)2","volume":"49","author":"Hillebrecht","year":"1994","journal-title":"Z. Naturforsch. B"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1183","DOI":"10.1038\/1831183a0","article-title":"Molecular Motion of Enclathrated Compounds as studied by Nuclear Magnetic Resonance","volume":"183","author":"Gilspon","year":"1959","journal-title":"Nature"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"293","DOI":"10.1023\/A:1007068408687","article-title":"Evidence for quasi-intramolecular acid-base reactions in solutions of transition metal ammine complexes","volume":"25","author":"Keszler","year":"2000","journal-title":"Transit. Met. Chem."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"292","DOI":"10.1023\/A:1022908030402","article-title":"Quasi-intramolecular acid-base reactions in aqueous solutions of metal-complexes of basic ligands I. Generalized theoretical considerations on the deammoniation of [MLm]Xn type ammonia complexes","volume":"28","author":"Kazinczy","year":"2003","journal-title":"Transit. Metal Chem."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"127","DOI":"10.1016\/S0898-8838(08)60270-6","article-title":"Protonation, Oligomerization, and Condensation Reactions of Vanadate(V), Molybdate(VI), and Tungstate(VI)","volume":"49","author":"Cruywagen","year":"1999","journal-title":"Adv. Inorg. Chem."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"215","DOI":"10.1063\/1.1725625","article-title":"Structure of the Aqueous Pertechnetate Ion by Raman and Infrared Spectroscopy. Raman and Infrared Spectra of Crystalline KTcO4, KReO4, Na2MoO4, Na2WO4, Na2MoO4\u00b72H2O, and Na2WO4\u00b72H2O","volume":"41","author":"Busey","year":"1964","journal-title":"J. Chem. Phys."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"5063","DOI":"10.1063\/1.1680724","article-title":"Assignment of \u03bd2(E) and \u03bd4(F2) of tetrahedral species by the calculation of the relative Raman intensities: The vibrational spectra of VO43\u2212, CrO42\u2212, MoO42\u2212, WO42\u2212, MnO4\u2212, TcO4\u2212, ReO4\u2212, RuO4, and OsO4","volume":"59","author":"Weinstock","year":"1973","journal-title":"J. Chem. Phys."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"114","DOI":"10.1002\/1521-3749(200101)627:1<114::AID-ZAAC114>3.0.CO;2-Y","article-title":"Study on the Existence of Hydrogen Bonds in Ammonium Permanganate","volume":"627","author":"Argay","year":"2001","journal-title":"Z. Anorg. Allg. Chem."},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Foga\u00e7a, L.A., Bereczki, L., Petru\u0161evski, V.M., Barta-Holl\u00f3, B., Franguelli, F.P., Mohai, M., B\u00e9res, K.A., Saj\u00f3, I.E., Szil\u00e1gyi, I.M., and Kotai, L. (2021). A Quasi-Intramolecular Solid-Phase Redox Reaction of Ammonia Ligands and Perchlorate Anion in Diamminesilver(I) Perchlorate. Inorganics, 9.","DOI":"10.3390\/inorganics9050038"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"2884","DOI":"10.1080\/00958972.2018.1493464","article-title":"The chemical identity of \u2018[Ag(py)2]MnO4\u2019 organic solvent soluble oxidizing agent and new synthetic routes for the preparation of [Ag(py)n]XO4 (X = Mn, Cl, Re, n = 2\u20134) complexes","volume":"71","author":"Pasinszki","year":"2018","journal-title":"J. Coord. Chem."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"3749","DOI":"10.1021\/acs.inorgchem.0c03498","article-title":"Solid-Phase Quasi-Intramolecular Redox Reaction of [Ag(NH3)2]MnO4: An Easy Way to Prepare Pure AgMnO2","volume":"60","author":"Fogaca","year":"2021","journal-title":"Inorg. Chem."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"871","DOI":"10.1080\/00387018808082349","article-title":"Vibrational spectra of [Zn(15NH3)4](ReO4)2 and [Cd(NH3)4](ReO4)2 with 110Cd\/116Cd and H\/D isotopic substitution","volume":"21","author":"Tellez","year":"1988","journal-title":"Spectr. Lett."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"111","DOI":"10.1080\/00268976600100171","article-title":"The spectra and electronic structure of tetrahedral ions","volume":"10","author":"Oleari","year":"1966","journal-title":"Mol. Phys."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"2907","DOI":"10.1016\/0022-1902(67)80123-4","article-title":"Spectroscopy of molybdenum(VI) compounds","volume":"29","author":"Bartecki","year":"1967","journal-title":"J. Inorg. Nucl. Chem."},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Ashley, J.H., and Mitchell, P.C.H. (1968). Cobalt-Molybdenum-Alumina hydrodesulphurization catalysts Part I. A spectroscopic and Magnetic Study of the Fresh Catalyst and Model Compounds. J. Chem. Soc. A, 2821\u20132827.","DOI":"10.1039\/J19680002821"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"493","DOI":"10.1007\/s10973-017-6901-4","article-title":"Evidence of quasi-intramolecular redox reactions during thermal decomposition of ammonium hydroxodisulfitoferriate(III), (NH4)2[Fe(OH)(SO3)2] H2O","volume":"132","author":"Kocsis","year":"2008","journal-title":"J. Therm. Anal. Calorim."},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Erdey, L. (1965). International Series of Monographs on Analtyical Chemsitry. Gravimetric Analysis, Part 1\u20132, Pergamon.","DOI":"10.1016\/B978-1-4831-9764-7.50049-0"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"81","DOI":"10.1007\/s10973-020-10494-4","article-title":"Thermal analysis of solvatomorphic decakis (dimethylammonium) dihydrogendodecatungstate hydrates","volume":"144","author":"Trif","year":"2021","journal-title":"J. Therm. Anal. Calorim."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"B\u00e9res, K.A., Petru\u0161evski, V.M., Barta Holl\u00f3, B., N\u00e9meth, P., Foga\u00e7a, L., Franguelli, F.P., Farkas, A., Menyh\u00e1rd, A., Szil\u00e1gyi, I.M., and K\u00f3tai, L. (2021). AgNO3\u22c5NH4NO3\u2014An enigmatic double-salt type \u201cdecomposition intermediate\u201d of diamminesilver(I) permanganate. Z. Anorg. Allgem. Chem.","DOI":"10.1002\/zaac.202100098"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"1523","DOI":"10.1021\/acsomega.0c05301","article-title":"Temperature-Limited Synthesis of Copper Manganites along the Borderline of the Amorphous\/Crystalline State and Their Catalytic Activity in CO Oxidation","volume":"6","author":"Solt","year":"2021","journal-title":"ACS Omega"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"28387","DOI":"10.1039\/C9RA03230D","article-title":"An unknown component of a selective and mild oxidant: Structure and oxidative ability of a double salt-type complex having \u03ba1O-coordinated permanganate anions and three- and four-fold coordinated silver cations","volume":"9","author":"May","year":"2019","journal-title":"RSC Adv."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"177","DOI":"10.1002\/zaac.201100467","article-title":"Studies on the chemistry of [Cd(NH3)4](MnO4)2. A low-temperature synthesis route of the CdMn2O4+x type NOx and CH3SH sensor precursors","volume":"638","author":"Jakab","year":"2012","journal-title":"Z. Anorg. Allgem. Chem."},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Franguelli, F.P., Barta Holl\u00f3, B., Petru\u0161evski, V.M., Saj\u00f3, I.E., Kl\u00e9bert, S., Farkas, A., B\u00f3dis, E., Szil\u00e1gyi, I.M., Pawar, R.P., and K\u00f3tai, L. (2020). Thermal decomposition and spectral characterization of di[carbonatotetraamminecobalt(III)] sulfate trihydrate and the nature of its thermal decomposition products. J. Therm. Anal. Calorim.","DOI":"10.1007\/s10973-020-09991-3"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"309","DOI":"10.1021\/ja01269a023","article-title":"Adsorption of gases in multimolecular layers","volume":"60","author":"Brunauer","year":"1938","journal-title":"J. Am. Chem. Soc."},{"key":"ref_36","unstructured":"Frisch, G.W.T.M.J., Schlegel, H.B., Scuseria, G.E., Robb, M.A., Cheeseman, J.R., Scalmani, G., Barone, V., Mennucci, B., Petersson, G.A., and Nakatsuji, H. (2009). Gaussian 09, Revision a.02, Gaussian, Inc."},{"key":"ref_37","doi-asserted-by":"crossref","unstructured":"Briggs, S.H.C. (1904). Ammoniacal Double Chromates and Molybdates. J. Chem. Soc. Trans., 672\u2013677.","DOI":"10.1039\/CT9048500672"}],"container-title":["Molecules"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1420-3049\/26\/13\/4022\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T06:24:22Z","timestamp":1760163862000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1420-3049\/26\/13\/4022"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,6,30]]},"references-count":37,"journal-issue":{"issue":"13","published-online":{"date-parts":[[2021,7]]}},"alternative-id":["molecules26134022"],"URL":"https:\/\/doi.org\/10.3390\/molecules26134022","relation":{},"ISSN":["1420-3049"],"issn-type":[{"value":"1420-3049","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,6,30]]}}}