Crystal structure of 4′-{[4-(2,2′:6′,2′′-terpyridyl-4′-yl)phenyl]ethynyl}biphenyl-4-yl (2,2,5,5-tetramethyl-1-oxyl-3-pyrrolin-3-yl)formate benzene 2.5-solvate

Abstract

The title compound, consisting of a terpyridine group linked to a N-oxylpyrroline-3-formate group by a phenyl­ethynylbiphenyl spacer, crystallized as a benzene two and a half solvate. Its structure is compared to that of the same mol­ecule that crystallized as a di­chloro­methane solvate and to a similar mol­ecule with a shorter spacer unit viz. ethynylphenyl.

PELDOR and RIDME Measurements on a High-Spin Manganese(II) Bisnitroxide Model Complex

“…43,67−69 The much larger observed increase of the modulation depth suggests a lower degree of ligand dissociation in the solvent system used in the study here. The corresponding distance distribution shows one dominating peak at 2.68 ± 0.06 nm in agreement with the value of 2.65 nm for the analogous, heteroleptic Mn(II) complex as reported by Akhmetzyanov et al 46 Furthermore, this distance fits nicely to the known geometry of the ligand 51 and is also similar to the metal nitroxide distance of 2.64 nm found using EPR spectroscopy and X-ray crystallography for the copper analogue of complex 1. 43 Furthermore, the width of the distance distribution is even slightly lower than for the copper analogue of 1, indicating that no additional zero-field splitting induced damping of the modulations occurs, in agreement with results obtained by Yulikov et al 70 Thus, the settings of the pulse sequence enabled a separation of the Mn(II)−nitroxide distance from the nitroxide−nitroxide distance.…”

“…The synthesis of the ligand 2,5-dihydro-2,2,5,5-tetramethylpyrrole-N-oxyle-3-(4′-(4-(2,2′:6′,2″-terpyridyl)-phenylethynyl-pbiphen-4-yl)carboxylate L has been described elsewhere. 51 Manganese diiodide and silver hexafluorophosphate were Manganese diiodide (13 mg, 0.042 mmol) was dissolved in 1 mL of dry acetonitrile at room temperature and mixed with 24 mg (0.095 mmol) of silver hexafluorophosphate dissolved in 0.5 mL of acetonitrile leading to immediate precipitation of silver iodide. The remaining solution was filtered off, and the precipitate was washed two times with 1 mL of acetonitrile.…”

Verdazyls as Possible Building Blocks for Multifunctional Molecular Materials: A Case Study on 1,5-Diphenyl-3-(p-iodophenyl)-verdazyl Focusing on Magnetism, Electron Transfer and the Applicability of the Sonogashira-Hagihara Reaction

“…The dihedral angles C 3 NNCH 2 and C 3 NNC Ph are similar to those in 3· and amount to 20.97° and 171.14°, respectively. The TMS-ethinylene unit deviates by about 8–9° from collinearity, similar to values observed before in molecules with phenylene–ethinylene backbones [ 56 , 57 , 58 , 59 ]. The packing of 5· strongly differs from the packing of 3· , probably due to the bulky TMS-C 2 substituent, and the molecules are arranged in a fishbone pattern along the c -axis ( Figure 4 b).…”

Verdazyls as Possible Building Blocks for Multifunctional Molecular Materials: A case Study on 1,5-Diphenyl-3-(p-iodophenyl)-verdazyl Focusing on Magnetism, Electron Transfer and the Applicability of the Sonogashira-Hagihara Reaction

“…and amount to 20.97° and 171.14°, respectively. The TMSethinylene unit deviates by about 8-9° from collinearity, similar to values observed before in molecules with phenylene-ethinylene backbones [56][57][58][59]. The packing of 5 .…”