{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,3]],"date-time":"2026-10-03T19:05:36Z","timestamp":1791054336793,"version":"4.1.0"},"reference-count":47,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2011,2,9]],"date-time":"2011-02-09T00:00:00Z","timestamp":1297209600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Angew Chem Int Ed"],"published-print":{"date-parts":[[2011,2,18]]},"DOI":"10.1002\/anie.201006982","type":"journal-article","created":{"date-parts":[[2011,2,9]],"date-time":"2011-02-09T07:35:28Z","timestamp":1297236928000},"page":"1841-1844","source":"Crossref","is-referenced-by-count":95,"title":["Switching through Coordination\u2010Coupled Proton Transfer"],"prefix":"10.1002","volume":"50","author":[{"given":"Xin","family":"Su","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas F.","family":"Robbins","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ivan","family":"Aprahamian","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2011,2,9]]},"reference":[{"key":"e_1_2_2_1_2","unstructured":"\u00a0"},{"key":"e_1_2_2_2_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr020467n"},{"key":"e_1_2_2_3_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.ica.2007.10.032"},{"key":"e_1_2_2_4_2","unstructured":"\u00a0"},{"key":"e_1_2_2_5_2","doi-asserted-by":"publisher","DOI":"10.1021\/bi980395n"},{"key":"e_1_2_2_6_2","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.96.11.6183"},{"key":"e_1_2_2_7_2","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.97.4.1548"},{"key":"e_1_2_2_8_2","doi-asserted-by":"publisher","DOI":"10.1021\/bi991800t"},{"key":"e_1_2_2_9_2","doi-asserted-by":"publisher","DOI":"10.1021\/bi0021636"},{"key":"e_1_2_2_10_2","doi-asserted-by":"publisher","DOI":"10.1021\/bi051149w"},{"key":"e_1_2_2_11_2","unstructured":"\u00a0"},{"key":"e_1_2_2_12_2","doi-asserted-by":"publisher","DOI":"10.1074\/jbc.M400208200"},{"key":"e_1_2_2_13_2","doi-asserted-by":"publisher","DOI":"10.1074\/jbc.M506107200"},{"key":"e_1_2_2_14_2","doi-asserted-by":"publisher","DOI":"10.1074\/jbc.M602254200"},{"key":"e_1_2_2_15_2","doi-asserted-by":"publisher","DOI":"10.1074\/jbc.M109.007203"},{"key":"e_1_2_2_16_2","unstructured":"\u00a0"},{"key":"e_1_2_2_17_2","volume-title":"Molecular Switches","year":"2001"},{"key":"e_1_2_2_18_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.200504313"},{"key":"e_1_2_2_18_3","doi-asserted-by":"publisher","DOI":"10.1002\/anie.200504313"},{"key":"e_1_2_2_19_2","doi-asserted-by":"publisher","DOI":"10.1002\/9783527621682"},{"key":"e_1_2_2_20_2","doi-asserted-by":"publisher","DOI":"10.1039\/b819333a"},{"key":"e_1_2_2_21_2","unstructured":"\u00a0"},{"key":"e_1_2_2_22_2","doi-asserted-by":"publisher","DOI":"10.1038\/nchem.481"},{"key":"e_1_2_2_23_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja103153t"},{"key":"e_1_2_2_24_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja105371u"},{"key":"e_1_2_2_25_2","unstructured":"For examples of electro\u2010 and photochemically induced pH modulations see:"},{"key":"e_1_2_2_26_2","doi-asserted-by":"publisher","DOI":"10.1039\/b806328c"},{"key":"e_1_2_2_27_2","doi-asserted-by":"publisher","DOI":"10.1002\/chem.200801645"},{"key":"e_1_2_2_28_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja9094796"},{"key":"e_1_2_2_29_2","unstructured":"\u00a0"},{"key":"e_1_2_2_30_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja909149z"},{"key":"e_1_2_2_31_2","doi-asserted-by":"publisher","DOI":"10.1021\/ol102422h"},{"key":"e_1_2_2_32_2","unstructured":"\u00a0"},{"key":"e_1_2_2_33_2","doi-asserted-by":"publisher","DOI":"10.1039\/p19840002109"},{"key":"e_1_2_2_34_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.poly.2007.05.023"},{"key":"e_1_2_2_35_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0076-6879(82)87029-8"},{"key":"e_1_2_2_36_2","doi-asserted-by":"publisher","DOI":"10.1039\/b9nj00498j"},{"key":"e_1_2_2_37_2","doi-asserted-by":"publisher","DOI":"10.1002\/chem.200902764"},{"key":"e_1_2_2_38_2","unstructured":"Because of the equilibrium the 2:1 complex persists no matter how much Zn2+is added. This dynamic equilibrium results in the broadening of some of the signals of the 1:1 complex. For the reverse titration of Zn2+ see Figure\u2005S10."},{"key":"e_1_2_2_39_2","unstructured":"A resonance structure can be drawn of an azo form in which the positive charge on the pyridinium nitrogen atom is neutralized. This resonance may explain the change in the pKa\u2005value of this system."},{"key":"e_1_2_2_40_2","unstructured":"Crystal data for Zn(QPH\u2010Z): C20H20F6N4O10S2Zn Mr=719.89 triclinic${P\\bar 1}$ a=8.1722(8) b=12.6323(12) c=13.7757(13)\u2005\u00c5 \u03b1=71.611(1) \u03b2=86.408(1) \u03b3=81.121(1)\u00b0 V=1333.2(2)\u2005\u00c53 T=173(2)\u2005K Z=2 \u03c1calcd=1.793\u2005g\u2009cm\u22123 \u03bc=1.182\u2005mm\u22121 2\u03b8max=50.24\u00b0 19\u2009397 reflections measured 4859 unique (Rint=0.0585) which were used in all calculations. The finalR\u03c9(F2) value was 0.1192 (all data). CCDC\u2005799047 (Zn(QPH\u2010Z)) and 799046 (Zn(QPH\u2010Z)2) contain the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre viawww.ccdc.cam.ac.uk\/data_request\/cif"},{"key":"e_1_2_2_41_2","unstructured":"In the crystal structure of Zn(QPH\u2010Z) the dihedral angle between the pyridyl ring and the quinolinyl ring is 12.740(63)\u00b0 and the torsion angles of N\u2010N\uf8feC\u2010C (pyridyl) and C\uf8feN\u2010N\u2010C (quinolinyl) are 178.801(232) and 178.875(235)\u00b0 respectively."},{"key":"e_1_2_2_42_2","unstructured":"Crystal data for Zn(QPH\u2010Z)2: C39H37Cl2N9.50O12.25Zn Mr=971.05 monoclinicP21\/c a=23.867(2) b=21.720(2) c=16.6544(16)\u2005\u00c5 \u03b1=90 \u03b2=101.7380(10) \u03b3=90\u00b0 V=8453.0(14)\u2005\u00c53 T=173(2)\u2005K Z=8 \u03c1calcd=1.526\u2005g\u2009cm\u22123 \u03bc=0.783\u2005mm\u22121 2\u03b8max=50.72\u00b0 81\u2009498 reflections measured 15\u2009435 unique (Rint=0.0667) which were used in all calculations. The finalR\u03c9(F2) value was 0.2125 (all data)."},{"key":"e_1_2_2_43_2","unstructured":"Hydrogen atom H7 of one ligand is oriented perpendicularly to the deprotonated hydrazone functional group of the other; hence it is shielded."},{"key":"e_1_2_2_44_2","unstructured":"In an intermolecular proton transfer the pyridyl nitrogen atom will be available for coordination with Zn2+. We see no evidence of this coordination thus further supporting the intramolecular pathway. This said we cannot absolutely rule out intermolecular proton transfer."},{"key":"e_1_2_2_45_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.201000380"},{"key":"e_1_2_2_45_3","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201000380"}],"container-title":["Angewandte Chemie International Edition"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1002%2Fanie.201006982","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/anie.201006982","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,10,16]],"date-time":"2023-10-16T11:53:22Z","timestamp":1697457202000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/anie.201006982"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2011,2,9]]},"references-count":47,"journal-issue":{"issue":"8","published-print":{"date-parts":[[2011,2,18]]}},"alternative-id":["10.1002\/anie.201006982"],"URL":"https:\/\/doi.org\/10.1002\/anie.201006982","archive":["Portico"],"relation":{},"ISSN":["1433-7851","1521-3773"],"issn-type":[{"value":"1433-7851","type":"print"},{"value":"1521-3773","type":"electronic"}],"subject":[],"published":{"date-parts":[[2011,2,9]]}}}