Trinuclear Metallacycles: Metallatriangles and Much More

One-step assembly of Re(i) tricarbonyl 2-pyridyltetrazolato metallacalix[3]arene with aqua emission and reversible three-electron oxidation

“…The variation of the emissive properties of these species could be used in conjunction with host-guest chemistry with sensing purpose. 3,18,19 However, there is a lack of systematic 25 syntheses for luminescent metallacalix [3]arenes with the aim of tuning their photophysical properties and their structural features. In our research, we have been investigating the photophysical properties of mononuclear tetrazolato and dinuclear tetrazolato-bridged rhenium tricarbonyl complexes, where the rhenium centres are chelated by bidentate 1,10-phenanthroline (phen) ligands.…”

“…The formulation and structure of 1 were elucidated by single crystal X-ray diffraction 5 studies ‡ (Figure 1), and also supported by NMR and IR spectroscopy as well as elemental analysis. In the solid state, † 1 displays a partial cone configuration (syn, syn, anti), 18 with one of the 2PyTz ligand oriented on the opposite side with respect to the other two. The NMR data suggest that the same structure is retained in solution: this is especially evident in considering the three doublets at 9.28, 9.23, and 9.13 ppm corresponding to the H2 atoms of the three pyridine rings.…”

Crystallographic Evidence for the Host-Guest Interaction of Metallamacromolecules (A Highlight Review)

“…Compound 7 was claimed as the largest neutral M 3 L' 3 triangle so far characterized structurally. 23 The characteristics associated with the recognition of molecular rectangles with respect to the planar aromatic molecules and the Ag ion was reported. The alkoxy-or thiolato-bridged molecular rectangles [{(CO) 3 Re(m-ER) 2 Re(CO) 3 } 2 (m-L5) 2 ] (8-11) (8, -OC 8 H 17 ; 9, -OC 12 H 25 ; 10, ER = -SC 4 H 9 ; 11, ER = -SC 8 H 17 ) were prepared by the reaction of Re 2 (CO) 10 with the 4,4'-bipyridine (L5, bpy) in the presence of higher aliphatic alcohols or a mercaptan Scheme 3: Self-assembly of neutral Re(I)-based rectangles 8-11 under solvothermal reaction (Scheme 3).…”

Attachment of Luminescent Neutral “Pt(pq)(C≡CtBu)” Units to Di and Tri N-Donor Connecting Ligands: Solution Behavior and Photophysical Properties

“…Several reviews have thoroughly covered this amazing field in the last years [31][32][33][34][35][36][37][38][39]. The inherent stability and rather low reactivity of the Pt(II) in contrast with other metals [i.e., Pd(II)] [40,41] has been the main attraction for the use of Pt(II) units for metallamacrocycles [42].…”