مشخصات پژوهش

صفحه نخست /Anion-driven tetrel ...
عنوان Anion-driven tetrel bond-induced engineering of lead(ii) architectures with N[prime or minute]-(1-(2-pyridyl)ethylidene)nicotinohydrazide: experimental and theoretical findings
نوع پژوهش مقاله چاپ‌شده در مجلات علمی
کلیدواژه‌ها N’-(1-(2-pyridyl)ethylidene)nicotinohydrazide, heteroleptic complexes, hemidirected coordination geometry
چکیده The evaluation of N’-(1-(2-pyridyl)ethylidene)nicotinohydrazide (HL) as a linker for the PbII tagged extended structures is described. The reaction of Pb(ClO4)2 or Pb(OAc)2 with HL in MeOH at 60 °C and room temperature, respectively, leads to heteroleptic complexes {[PbL]ClO4}n·nH2O and [PbL(OAc)]2, while the same reaction of Pb(ClO4)2 with HL at 60 °C in the presence of two equivalents of NaOAc or NaNO2 leads to heteroleptic complexes {[Pb(HL)(OAc)]ClO4}n and [PbL(NO2)]n, respectively. Using Pb(NO3)2 as a source of PbII in the same reaction with HL and two equivalents of NaN3 or NaNCS at room temperature yields [PbLN3]n and [Pb2(HL)2(NO3)2(NCS)2], respectively. The room temperature reaction of Pb(NO3)2 with HL in the presence of two equivalents of NaClO4 leads to the transformation of the parent ligand to its perchlorate salt [H2L]ClO4. In all the obtained PbII structures, HL or its deprotonated form L acts both as a chelating and a bridging ligand. The nature of the inorganic anion also influences the final structure. In all complexes the PbII center exhibits a hemidirected coordination geometry with all the covalent bonds being concentrated on one hemisphere of the coordination sphere with the closest approach of two atoms on the other side varying from 151° to 232°. The sterically available PbII ion partici- pates in tetrel bonding as evidenced from the detailed structural analysis of the described complexes. As a result of tetrel bonding, the structures of all the six compounds can be extended to a higher dimensional framework, which is further stabilized by π⋯π stacking interactions between the aromatic rings. The DFT based charge and energy decomposition (ETS-NOCV) calculations are performed in order to shed light on the nature of non-covalent interactions that determine the stability of the obtained structures.
پژوهشگران مایچل فلک (نفر ششم به بعد)، فرانزیسکا لوچرر (نفر ششم به بعد)، توماس دوئرت (نفر ششم به بعد)، ماسیج کوبیکی (نفر پنجم)، مجتبی امینی (نفر چهارم)، مارسیز میتوراج (نفر سوم)، دمیر سفین (نفر دوم)، قدرت محمودی (نفر اول)