Lanthanoid tetrazole coordination complexes

Influence of the Para-Substituent in Lanthanoid Complexes of Bistetrazole Substituted Calix[4]arenes

“…The metal coordination is similar in both molecules, but an ammonium cation is situated in the calixarene cavity of molecule 1, whereas a solvent ethanol molecule occupies a similar position in molecule 2 ( Figure 2). [10] Inclusion in p-sulfonatocalix [4]arene has also been reported, although the protons of the cation were not located. [10] Inclusion in p-sulfonatocalix [4]arene has also been reported, although the protons of the cation were not located.…”

“…[10] Inclusion in p-sulfonatocalix [4]arene has also been reported, although the protons of the cation were not located. While hydrogen bonds between primary alkyl ammonium cations and phenol O atoms of larger calix [5]arene [12] and calix[6]arene [13] hosts are well established, such interactions are rare in calix [4]arenes. In contrast, here the disposition of the ammonium cation is consistent with a hydrogen bond between the ammonium cation and a phenol O atom (N1···O21, 3.159(7) Å).…”

“…[1] We have previously reported the isolation of an unexpected elongated Ln19 "bottlebrush" cluster when the bis-tetrazole calix [4]arene 1 was allowed to react with a lanthanoid precursor (Eu -Lu) with addition of an aqueous ammonium acetate buffer solution ( Figure 1). The formation of lanthanoid clusters is a particular challenge for the synthetic chemist, with the outcomes of specific lanthanoid-ligand combinations still very difficult to predict in general, although some systems are relatively well understood.…”

“…[1] We have previously reported the isolation of an unexpected elongated Ln19 "bottlebrush" cluster when the bis-tetrazole calix [4]arene 1 was allowed to react with a lanthanoid precursor (Eu -Lu) with addition of an aqueous ammonium acetate buffer solution ( Figure 1). [4] The high aspect ratio of the Ln19 cluster was particularly plexes of the p-H and p-allyl calixarenes were characterised by single-crystal X-ray diffraction, and were found to form mononuclear complexes, linked to form a one-dimensional coordination polymer for the p-allyl system. [3] These results emphasised the structural versatility of the tetrazole moiety, which is often found in the second coordination sphere of lanthanoid complexes, even when incorporated in a polydentate ligand.…”

Synthesis, characterization and catalytic performance of Pd(II) complex immobilized on Fe3O4@SiO2 nanoparticles for the ligand‐free cyanation of aryl halides using K4Fe(CN)6

“…Recently, the use of core‐shell nanocomplexes as effective heterogeneous nanocatalysts has been rapidly increased in a widespread variety of organic transformations . Most recently, our laboratory designed the synthesis of nanocomplexes using core‐shell MNPs supported ionic liquids or copper and palladium complexes with various tetrazoles as nitrogen‐rich heterocycles .…”