H NMR (400 MHz, DMSO-d 6 , δ, ppm): 10.34 (s, 1H), 9.17 (d, J = 1.8 Hz, 1H), 9.11 (d, J = 1.2 Hz, 2H), 8.96 (d, J = 3.0 Hz, 1H), 8.90 (t, J = 2.2 Hz, 2H), 8.25 (d, J = 1.8 Hz, 1H), 8.18 (d, J = 9.0 Hz, 2H), 6.72 (d, J = 9.0 Hz, 2H), 3.38 (d, J = 6.5 Hz, 4H), 2.01 (t, J = 6.4 Hz, 4H).13C NMR not recorded due to insufficient complex solubility. HRMS (ESI): calcd for C 26 H 20 N 6 O 3 ReCl [M + Na] + 709.13 g mol −1 ; found 709.07 g mol −1 .

Three pentacoordinate complexes of the type [Co­(pypz)­X2], where pypz is a tridentate ligand 2,6-bis­(pyrazol-1-yl)­pyridine and X = Cl– (1), NCS– (2), and NCO– (3), have been synthesized, and their structures have been determined by X-ray analysis. The DC magnetic data show a sizable magnetic anisotropy, which was confirmed by high-field high-frequency electron paramagnetic resonance (HF EPR) measurements. Well-resolved HF EPR spectra of high spin cobalt (II) were observed over the microwave frequency range 100–650 GHz. The experimental spectra of both complexes were simulated with axial g tensor components, a very large positive D value, and different E/D ratios. To determine the exact D value for 2 (38.4 cm–1) and 3 (40.92 cm–1), the far-infrared magnetic spectroscopy method was used. Knowledge of the zero field splitting parameters and their signs is crucial in interpreting the single-molecule magnet or single chain magnet behavior. The AC susceptibility data confirm that these complexes exhibit a slow magnetic relaxation under small applied DC field with two (1 and 3) or three (2) relaxation modes.

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Several 2,2':6',2''-terpyridines substituted in the 4'-position were synthesized and their photophysical properties were investigated by absorption and photoluminescence spectroscopy in dilute solutions and solid state. The studies confirmed that the absorption and emission wavelengths, fluorescence quantum yields and lifetimes of 1-R(1-16) are strongly structure-related, demonstrating a decisive role of the nature of the substituent in determining the photophysical properties of 4'-functionalized terpyridines. Additionally, the density functional theory (DFT) calculations were performed for 1-R(1-16) to get insight into their electronic structure and spectroscopic properties.

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