Synthesis and photophysical properties of rare earth (La, Nd, Gd, Y, Ho) complexes with silanediamido ligands bearing a chelating phenylbenzothiazole chromophore

Abstract

New silanediamide ligand bearing chromophore 2-phenylbenzothiazole (Pbt) groups SiMe2(HNPbt)2 (1H) was synthesized and introduced in the lanthanide complexes. It was found that independently of the stoichiometry of the salt metathesis...

Pd(II)- and Pt(II)-Assisted P–C Activation/Cyclization Reactions with a Luminescent α-Aminophosphine

“…Relative orientation of N -phenyl and benzothiazole moieties in compound 5 (Figure S9, SI and description therein) differs from that in other reported NH-Pbt derivatives ,,,, due to the absence of intramolecular hydrogen bonds and the presence of shortened N···S contact. − This conformational feature allows the protonated NH-Pbt moiety to be easily recognizable from the nonprotonated N-Pbt.…”

Lanthanide complexes with a new luminescent iminophosphonamide ligand bearing phenylbenzothiazole substituents

“…[25][26][27]31 Compound 1 is poorly soluble in non-polar solvents, nearly insoluble in CH 3 CN, and highly soluble in thf, and it exhibits no signs of decomposition in the air as a solid, which is seen from the NMR spectral consistency. Following our experience with silanediamine SiMe 2 (HNPbt) 2 , 50 1), while the H atom is clearly located at N1 as seen in the residual electron density map. The molecule of 1 (Fig.…”

“…25–27,31 Compound 1 is poorly soluble in non-polar solvents, nearly insoluble in CH 3 CN, and highly soluble in thf, and it exhibits no signs of decomposition in the air as a solid, which is seen from the NMR spectral consistency. Following our experience with silanediamine SiMe 2 (HNPbt) 2 , 50 further hydrolysis of the PN bond to phosphine oxide may be inhibited until the compound powder is wetted upon dissolution. The NMR spectrum of 1 possesses a set of distinct signals of aromatic protons, which show non-equivalence of Pbt moieties at N-atoms (Fig.…”

“…When compared, it turns out that two Y complexes with similar coordination spheres, complex 3 and the previously studied complex [Li(thf) 4 ][Y(SiMe 2 (NPbt) 2 ) 2 ], 50 have resembling pairwise stacking of Pbt moieties, but with an overall different architecture. The dianionic nature of ligands and smaller angle N–Si–N in the silanediamide complex result in changes in stacking, reducing the dihedral angle between the Ph rings and the (N Si N) planes.…”

“…In the complex of the smallest Y, a decrease in the Ln 3+ radius shifts the ligands towards each other, so the overlapping in the first pair increases, placing the Ph rings against the C3a′-C7a′ bond in the benzothiazole fragment at a distance of 3.31-3.39 Å. When compared, it turns out that two Y complexes with similar coordination spheres, complex 3 and the previously studied complex [Li(thf) 4 ][Y(SiMe 2 (NPbt) 2 ) 2 ], 50 have resembling pairwise stacking of Pbt moieties, but with an overall different architecture. The dianionic nature of ligands and smaller angle N-Si-N in the silanediamide complex result in changes in stacking, reducing the dihedral angle between the Ph rings and the (N Si N) planes.…”