{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T19:49:13Z","timestamp":1760298553264,"version":"build-2065373602"},"reference-count":121,"publisher":"Wiley","issue":"31","license":[{"start":{"date-parts":[[2012,7,2]],"date-time":"2012-07-02T00:00:00Z","timestamp":1341187200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Chemistry A European J"],"published-print":{"date-parts":[[2012,7,27]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The synthesis and characterization of ferrocene\u2010based oligomers that contained two different elements (Si and Sn) as alternating bridges is described for the first time. The salt\u2010metathesis reaction of R<jats:sub>2<\/jats:sub>Si[(C<jats:sub>5<\/jats:sub>H<jats:sub>4<\/jats:sub>)Fe(C<jats:sub>5<\/jats:sub>H<jats:sub>4<\/jats:sub>Li)]<jats:sub>2<\/jats:sub> (R=Me, Et) with R\u2032<jats:sub>2<\/jats:sub>SnCl<jats:sub>2<\/jats:sub> (R\u2032=Me, <jats:italic>n<\/jats:italic>Bu, <jats:italic>t<\/jats:italic>Bu) afforded a mixture of oligomers (<jats:bold>6<jats:sup>Me<\/jats:sup>SnMe<jats:sub>2<\/jats:sub><\/jats:bold>, <jats:bold>6<jats:sup>Et<\/jats:sup>SnMe<jats:sub>2<\/jats:sub><\/jats:bold>, <jats:bold>6<jats:sup>Me<\/jats:sup>Sn<jats:italic>n<\/jats:italic>Bu<jats:sub>2<\/jats:sub><\/jats:bold>, <jats:bold>6<jats:sup>Et<\/jats:sup>Sn<jats:italic>n<\/jats:italic>Bu<jats:sub>2<\/jats:sub><\/jats:bold>, <jats:bold>6<jats:sup>Me<\/jats:sup>Sn<jats:italic>t<\/jats:italic>Bu<jats:sub>2<\/jats:sub><\/jats:bold>, and <jats:bold>6<jats:sup>Et<\/jats:sup>Sn<jats:italic>t<\/jats:italic>Bu<jats:sub>2<\/jats:sub><\/jats:bold>). These oligomers were characterized by <jats:sup>1<\/jats:sup>H, <jats:sup>13<\/jats:sup>C, <jats:sup>29<\/jats:sup>Si, and <jats:sup>119<\/jats:sup>Sn\u2005NMR spectroscopy and by mass spectrometry. MS (MALDI\u2010TOF) studies of <jats:bold>6<jats:sup>Et<\/jats:sup>SnMe<jats:sub>2<\/jats:sub><\/jats:bold> revealed the presence of linear (<jats:italic>l<\/jats:italic>) and cyclic (<jats:italic>c<\/jats:italic>) species that contained up to 20\u2005ferrocene moieties. The molecular weights of the polymers were determined by gel\u2010permeation chromatography (GPC) and by dynamic\u2010light scattering (DLS). GPC analysis revealed average molecular weights of 2100\u20136300\u2005Da with respect to polystyrene as a standard. DLS analysis yielded very similar results. Some compounds, <jats:italic><jats:bold>c<\/jats:bold><\/jats:italic><jats:bold>\u2010(6<jats:sup>Me<\/jats:sup>SnMe<jats:sub>2<\/jats:sub>)<jats:sub>1<\/jats:sub><\/jats:bold>, <jats:italic><jats:bold>c<\/jats:bold><\/jats:italic><jats:bold>\u2010(6<jats:sup>Me<\/jats:sup>Sn<jats:italic>t<\/jats:italic>Bu<jats:sub>2<\/jats:sub>)<jats:sub>2<\/jats:sub><\/jats:bold>, <jats:italic><jats:bold>c<\/jats:bold><\/jats:italic><jats:bold>\u2010(6<jats:sup>Et<\/jats:sup>SnMe<jats:sub>2<\/jats:sub>)<jats:sub>1<\/jats:sub><\/jats:bold>, <jats:italic><jats:bold>c<\/jats:bold><\/jats:italic><jats:bold>\u2010(6<jats:sup>Et<\/jats:sup>Sn<jats:italic>t<\/jats:italic>Bu<jats:sub>2<\/jats:sub>)<jats:sub>2<\/jats:sub><\/jats:bold>, <jats:italic><jats:bold>l<\/jats:bold><\/jats:italic><jats:bold>\u2010(6<jats:sup>Me<\/jats:sup>Sn<jats:italic>n<\/jats:italic>Bu<jats:sub>2<\/jats:sub>)<jats:sub>2<\/jats:sub><\/jats:bold>, and <jats:italic><jats:bold>l<\/jats:bold><\/jats:italic><jats:bold>\u2010(6<jats:sup>Me<\/jats:sup>Sn<jats:italic>n<\/jats:italic>Bu<jats:sub>2<\/jats:sub>)<jats:sub>3<\/jats:sub><\/jats:bold>, which contained up to six ferrocene moieties, were isolated in their pure form either by column chromatography or by crystallization. The Si\u2010 and Sn\u2010bridged macrocycles that contained four ferrocene units (<jats:italic><jats:bold>c<\/jats:bold><\/jats:italic>\u2010(<jats:bold>6<jats:sup>Me<\/jats:sup>Sn<jats:italic>t<\/jats:italic>Bu<jats:sub>2<\/jats:sub>)<jats:sub>2<\/jats:sub><\/jats:bold> and <jats:italic><jats:bold>c<\/jats:bold><\/jats:italic><jats:bold>\u2010(6<jats:sup>Et<\/jats:sup>Sn<jats:italic>t<\/jats:italic>Bu<jats:sub>2<\/jats:sub>)<jats:sub>2<\/jats:sub><\/jats:bold>) were structurally characterized by single\u2010crystal X\u2010ray analysis.<\/jats:p>","DOI":"10.1002\/chem.201200953","type":"journal-article","created":{"date-parts":[[2012,7,2]],"date-time":"2012-07-02T09:45:27Z","timestamp":1341222327000},"page":"9722-9733","source":"Crossref","is-referenced-by-count":13,"title":["Cyclic and Linear Polyferrocenes with Silicon and Tin as Alternating Bridges"],"prefix":"10.1002","volume":"18","author":[{"given":"Bidraha","family":"Bagh","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nora C.","family":"Breit","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Subhayan","family":"Dey","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joe B.","family":"Gilroy","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gabriele","family":"Schatte","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Klaus","family":"Harms","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jens","family":"M\u00fcller","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2012,7,2]]},"reference":[{"key":"e_1_2_6_1_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja00041a053"},{"key":"e_1_2_6_2_2","unstructured":"\u00a0"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.1066321"},{"key":"e_1_2_6_4_2","doi-asserted-by":"publisher","DOI":"10.1002\/3527601686"},{"key":"e_1_2_6_5_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.200604420"},{"key":"e_1_2_6_5_3","doi-asserted-by":"publisher","DOI":"10.1002\/anie.200604420"},{"key":"e_1_2_6_6_2","doi-asserted-by":"publisher","DOI":"10.1039\/B610016C"},{"key":"e_1_2_6_7_2","doi-asserted-by":"publisher","DOI":"10.1002\/adma.200702876"},{"key":"e_1_2_6_8_2","doi-asserted-by":"publisher","DOI":"10.1039\/b601574n"},{"key":"e_1_2_6_9_2","doi-asserted-by":"publisher","DOI":"10.1016\/S1369-7021(08)70054-3"},{"key":"e_1_2_6_10_2","doi-asserted-by":"publisher","DOI":"10.1002\/marc.200900908"},{"key":"e_1_2_6_11_2","doi-asserted-by":"publisher","DOI":"10.1002\/marc.200900690"},{"key":"e_1_2_6_12_2","doi-asserted-by":"publisher","DOI":"10.1039\/b925709h"},{"key":"e_1_2_6_13_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jorganchem.2010.11.048"},{"key":"e_1_2_6_14_2","doi-asserted-by":"publisher","DOI":"10.1038\/nmat2966"},{"key":"e_1_2_6_15_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.287.5457.1460"},{"key":"e_1_2_6_16_2","doi-asserted-by":"publisher","DOI":"10.1038\/nphoton.2007.140"},{"key":"e_1_2_6_17_2","doi-asserted-by":"publisher","DOI":"10.1038\/nmat1716"},{"key":"e_1_2_6_18_2","unstructured":"\u00a0"},{"key":"e_1_2_6_19_2","doi-asserted-by":"publisher","DOI":"10.1038\/nchem.664"},{"key":"e_1_2_6_20_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja207417z"},{"key":"e_1_2_6_21_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.1141382"},{"key":"e_1_2_6_22_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja202662u"},{"key":"e_1_2_6_23_2","doi-asserted-by":"publisher","DOI":"10.1038\/nmat2356"},{"key":"e_1_2_6_24_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.201003066"},{"key":"e_1_2_6_24_3","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201003066"},{"key":"e_1_2_6_25_2","doi-asserted-by":"publisher","DOI":"10.1007\/BF01177652"},{"key":"e_1_2_6_26_2","unstructured":"\u00a0"},{"key":"e_1_2_6_27_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-328X(00)83656-6"},{"key":"e_1_2_6_28_2","doi-asserted-by":"publisher","DOI":"10.1039\/p29730000138"},{"key":"e_1_2_6_29_2","doi-asserted-by":"publisher","DOI":"10.1021\/om00031a007"},{"key":"e_1_2_6_30_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.200390214"},{"key":"e_1_2_6_30_3","doi-asserted-by":"publisher","DOI":"10.1002\/anie.200390245"},{"key":"e_1_2_6_31_2","unstructured":"\u00a0"},{"key":"e_1_2_6_32_2","doi-asserted-by":"publisher","DOI":"10.1021\/ic0501925"},{"key":"e_1_2_6_33_2","doi-asserted-by":"publisher","DOI":"10.1021\/ic051616y"},{"key":"e_1_2_6_34_2","doi-asserted-by":"publisher","DOI":"10.1107\/S1600536805007695"},{"key":"e_1_2_6_35_2","unstructured":"\u00a0"},{"key":"e_1_2_6_36_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-328X(01)00923-8"},{"key":"e_1_2_6_37_2","doi-asserted-by":"publisher","DOI":"10.1002\/1521-3757(20010417)113:8<1469::AID-ANGE1469>3.0.CO;2-W"},{"key":"e_1_2_6_37_3","doi-asserted-by":"publisher","DOI":"10.1002\/1521-3773(20010417)40:8<1423::AID-ANIE1423>3.0.CO;2-G"},{"key":"e_1_2_6_38_2","doi-asserted-by":"publisher","DOI":"10.1021\/om020185d"},{"key":"e_1_2_6_39_2","doi-asserted-by":"publisher","DOI":"10.1021\/om030115m"},{"key":"e_1_2_6_40_2","doi-asserted-by":"publisher","DOI":"10.1021\/om800342e"},{"key":"e_1_2_6_41_2","unstructured":"\u00a0"},{"key":"e_1_2_6_42_2","doi-asserted-by":"publisher","DOI":"10.1515\/znb-1995-1117"},{"key":"e_1_2_6_43_2","doi-asserted-by":"publisher","DOI":"10.1016\/0022-328X(94)05027-9"},{"key":"e_1_2_6_44_2","doi-asserted-by":"publisher","DOI":"10.1039\/DT9950001893"},{"key":"e_1_2_6_45_2","doi-asserted-by":"publisher","DOI":"10.1002\/marc.1995.030160901"},{"key":"e_1_2_6_46_2","doi-asserted-by":"publisher","DOI":"10.1246\/cl.1996.649"},{"key":"e_1_2_6_47_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0277-5387(99)00357-5"},{"key":"e_1_2_6_48_2","doi-asserted-by":"publisher","DOI":"10.1021\/om000991p"},{"key":"e_1_2_6_49_2","doi-asserted-by":"publisher","DOI":"10.1021\/om0204078"},{"key":"e_1_2_6_50_2","doi-asserted-by":"publisher","DOI":"10.1246\/cl.2004.520"},{"key":"e_1_2_6_51_2","doi-asserted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used to differentiate between the cyclic and linear species (Figure\u20055)."},{"key":"e_1_2_6_74_2","unstructured":"Different conformers of linear oligo(ferrocenyldimethylsilanes)of the general formula CpFe(C5H4)[SiMe2Fe(C5H4)2]n\u22121H with up to five ferrocene moieties have been investigated by using force\u2010field calculations and the relative orientations of the fc units at the Si centers were defined by angles\u03c6and\u03c8 each of which was defined as the torsion angle Fe\uf8ffCipso\uf8ffSi\uf8ffCipso. For example for thetrans transconformer (Figure\u20054) \u03c6=\u03c8=180\u00b0; see:"},{"key":"e_1_2_6_75_2","doi-asserted-by":"publisher","DOI":"10.1039\/cc9960000257"},{"key":"e_1_2_6_76_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja953680s"},{"key":"e_1_2_6_77_2","unstructured":"\u00a0"},{"key":"e_1_2_6_78_2","doi-asserted-by":"publisher","DOI":"10.1107\/S010827019400658X"},{"key":"e_1_2_6_79_2","doi-asserted-by":"publisher","DOI":"10.1021\/om00021a043"},{"key":"e_1_2_6_80_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja962470s"},{"key":"e_1_2_6_81_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja904928c"},{"key":"e_1_2_6_82_2","unstructured":"\u00a0"},{"key":"e_1_2_6_83_2","first-page":"40","author":"Loewendahl M.","year":"1993","journal-title":"J. Chem. Res. Synop."},{"key":"e_1_2_6_84_2","doi-asserted-by":"publisher","DOI":"10.1021\/om00010a041"},{"key":"e_1_2_6_85_2","unstructured":"Carbon\u2010bridged [1.1]FCPs typically crystallize assyn\u2005isomers and degeneratesyn\u2010to\u2010synisomerization occurs in solution. [1.1]FCPs that contain larger bridging elements usually crystallize asanti\u2005isomers. For example ananti\u2010to\u2010antiisomerization was investigated by using VT\u2005NMR spectroscopy for a diinda[1.1]ferrocenophane (see reference\u2005[13])."},{"key":"e_1_2_6_86_2","unstructured":"In general bothc\u2010(6MeSntBu2)2andc\u2010(6EtSntBu2)2species each contain 16\u2005\u03b1\u2010H atoms and 16\u2005\u03b2\u2010H atoms all of which are in special positions (not on a symmetry element) in their ground\u2010state structures (C2horD2symmetry). Because these symmetries both have the group order ofh=4 a set of 16\u2005H atoms will give 16\/h=4 signals. Because the ring inversion results in an increase of the group order by a factor of two (D2h;h=8) a set of 16\u2005H atoms will give 16\/h=2 signals; i.e. two signals for all of the\u03b1\u2010H atoms and two signals for all of the\u03b2\u2010H atoms."},{"key":"e_1_2_6_87_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja01038a077"},{"key":"e_1_2_6_88_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.19971090416"},{"key":"e_1_2_6_88_3","doi-asserted-by":"publisher","DOI":"10.1002\/anie.199703871"},{"key":"e_1_2_6_89_2","unstructured":"Stanna[1]ferrocenophanes are only know with the bulky substituentstBu 2 4 6\u2010trimethylphenyl and 2 4 6\u2010triisopropylphenyl; see:"},{"key":"e_1_2_6_90_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.19961081609"},{"key":"e_1_2_6_90_3","doi-asserted-by":"publisher","DOI":"10.1002\/anie.199618051"},{"key":"e_1_2_6_91_2","doi-asserted-by":"publisher","DOI":"10.1021\/om9805234"},{"key":"e_1_2_6_92_2","doi-asserted-by":"publisher","DOI":"10.1021\/ma00063a037"},{"key":"e_1_2_6_93_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-328X(00)90295-X"},{"key":"e_1_2_6_94_2","unstructured":"Signals in1H\u2005NMR spectra at\u03b4=4.04\u2005ppm and\u03b4=4.07\u20134.09\u2005ppm were assigned to the Cp end\u2010groups in poly(ferrocenyldiethylsilane)and oligo(ferrocenyldimethylsilane); see references\u2005[28c \u200945]."},{"key":"e_1_2_6_95_2","unstructured":"In reference\u2005[36] the resonance at\u03b4=72.3\u2005ppm was assigned to the Cipsoatom of poly(ferrocenyldiethylsilane). By using13C\u2010APT measurements we found that the signals at\u03b4=70.1 (6EtSnMe2) 70.0 (6EtSnnBu2) and 69.9\u2005ppm (6EtSntBu2) are due to Cipsoatoms. To explore this discrepancy in the assignments of the Cipsoatoms further a13C\u2005DEPT\u2005NMR spectrum of poly(ferrocenyldiethylsilane)was re\u2010measured thereby revealing that its Cipsoatom resonates at\u03b4=70.4\u2005ppm and confirming that the assignments of\u03b4=74.4 (Cp) 72.3 (Cp C\uf8ffSi) and 70.4\u2005ppm (Cp) in the original report (reference\u2005[36]) should have been\u03b4=74.4 (Cp) 72.3 (Cp) and 70.4\u2005ppm (Cp C\uf8ffSi)."},{"key":"e_1_2_6_96_2","doi-asserted-by":"publisher","DOI":"10.1021\/om8004004"},{"key":"e_1_2_6_97_2","doi-asserted-by":"publisher","DOI":"10.1021\/om010591h"},{"key":"e_1_2_6_98_2","doi-asserted-by":"publisher","DOI":"10.1002\/cber.19801130233"},{"key":"e_1_2_6_99_2","unstructured":"For related macrocyclic sandwich compounds see:"},{"key":"e_1_2_6_100_2","doi-asserted-by":"publisher","DOI":"10.1002\/1521-3765(20021115)8:22<5219::AID-CHEM5219>3.0.CO;2-H"},{"key":"e_1_2_6_101_2","doi-asserted-by":"publisher","DOI":"10.1002\/1521-3757(20020402)114:7<1231::AID-ANGE1231>3.0.CO;2-V"},{"key":"e_1_2_6_101_3","doi-asserted-by":"publisher","DOI":"10.1002\/1521-3773(20020402)41:7<1181::AID-ANIE1181>3.0.CO;2-A"},{"key":"e_1_2_6_102_2","doi-asserted-by":"publisher","DOI":"10.1021\/om9905660"},{"key":"e_1_2_6_103_2","doi-asserted-by":"publisher","DOI":"10.1021\/om0004085"},{"key":"e_1_2_6_104_2","doi-asserted-by":"publisher","DOI":"10.1021\/ma1029289"},{"key":"e_1_2_6_105_2","doi-asserted-by":"publisher","DOI":"10.1016\/0022-328X(95)05813-5"},{"key":"e_1_2_6_106_2","unstructured":"B.\u2005V. Nonius Nonius BV Delft The Netherlands Delft The Netherlands 1998."},{"key":"e_1_2_6_107_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0076-6879(97)76066-X"},{"key":"e_1_2_6_108_2","doi-asserted-by":"publisher","DOI":"10.1107\/S002188980403225X"},{"key":"e_1_2_6_109_2","doi-asserted-by":"publisher","DOI":"10.1107\/S0108767307043930"},{"key":"e_1_2_6_110_2","unstructured":"Bruker Bruker AXS Inc. 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