3‐(Pyridin‐2‐yl)imidazo[1,5‐a]pyridine (Pyridylindolizine) as Ligand in Complexes of Transition and Main‐Group Metals

Abstract

Keywords: Chelate complexes / N ligands / Ligand effects / Ligand design / D-block metalsThe coordination of the easily prepared 3-(pyridin-2-yl)imidazo[1,5-a]pyridine (pyridylindolizine, Py-indz) ligand to several metal moieties was studied, and its electronic properties, similar to those of the classical ligands 2,2Ј-bipyridine (bipy) and 1,10-phenanthroline (phen), are reported. The new complexes were prepared and fully characterized by Xray crystallography and other typical spectroscopic methods if possible. Paramagnetic complexes [Ni(S 2 X) 2 (Py-indz)] X = P(OEt) 2 (1), COEt (2) (7) have the magnetic moment expected for a metallic cation with two or five unpaired electrons. Diamagnetic complexes show NMR spectra with similar patterns with small differences depending on the com-

Electrochemically Driven Reduction of Carbon Dioxide Mediated by Mono‐Reduced Mo‐Diimine Tetracarbonyl Complexes: Electrochemical, Spectroelectrochemical and Theoretical Studies

“…The complexes 1 , 2 and 3 were prepared following previously described procedures and characterized by 1 H NMR and IR spectroscopy (see Supplementary Information) [14a,b,e,15] . The solids were analyzed by solid state IR spectroscopy using an ATR detector.…”

“…Stretching energies did not significantly vary within the series, in agreement with X‐ray data. The already‐published XRD structures [14a,d,f] offer the possibility to analyze bond lengths and angles at solid state for 1 , 2 and 3 (Tables S2 and S3). The three molybdenum complexes exhibit a pseudo‐octahedral geometry centered on the metal atom, with two axial and two equatorial carbonyl ligands.…”

“…Complexes 1 , 2 and 3 were synthesized according to reported procedures [14a,e,33] . The detailed synthesis and spectroscopic characterization of the complexes are given in the electronic supplementary information part.…”

Combining a Phenanthroline Moiety with Peralkylated Guanidine Residues: Homometallic CuII, NiII and ZnII Halide Complexes with Site‐Differentiating Janus Head Ligands

“…The associated values of µ eff compare reasonably well with those of other characterized nickel(II) complexes. [43b], …”

Crystal engineering of aurophilic supramolecular architectures and coordination polymers based on butterfly-like copper–dicyanoaurate complexes: vapochromism, P–T behaviour and multi-metallic cocrystal formation

“…Complex 4 has the peculiarity of being one of the stable imidazo [1,5a]pyridine complexes formed by the Cu(II) ion. [75][76][77][78][79][80][81] The stability of Cu(II) may be related to the presence of dicyanoaurate in the first coordination sphere. Compound Cu(L4)[(μ-CN)Au(CN)]} ∞ •CH 3 CN 5 has Cu(I) cations with a tetrahedral environment of L4.…”