Antiparallel alignment of the two angular momenta in a photoexcited dysprosium–phthalocyanine complex

Abstract

Intramolecular magnetic interaction between the 4f electronic system in a dysprosium ion and a photoexcited macrocyclic π conjugate system in a dysprosium-phthalocyaninato 1:1 complex, [DyPc(cyclen)]Cl (Pc2− = phthalocyaninato dianion, cyclen...

Tuning of the antiferromagnetic-type interaction in photo-excited single-decker porphyrin–lanthanide complexes with different crown capping ligands

“…Additionally, this finding is relatively consistent with the experimental results, and simulations using J z = | ± 11/2〉 and J z = | ± 13/2〉 yield good fits to the experimental MCD data. Indeed, this finding reinforces the observation on [DyPc(cyclen)] + , as reported earlier, 33 where a small energy separation (approximately 10 −1 cm) exists between the lowest and second lowest substates so that the two substates can potentially exchange with each other.…”

“…23 Furthermore, the Δ JL values were determined for possible two cases where the transitions occur from | ± 13/2〉 or | ± 11/2〉 as previously reported by our group. 33…”

“…23 Furthermore, the Δ JL values were determined for possible two cases where the transitions occur from | ± 13/2〉 or | ± 11/2〉 as previously reported by our group. 33 Out of the two cases, the | ± 13/2〉 case gave the smallest errors for the B and Q bands in both complexes (refer to Table S5 †). For [Dy(TPP)(12C4)] + , however, there is almost no difference in the Δ JL values in all bands when |J z 〉 = | ± 11/2〉 is assumed.…”

Toward Magneto‐Optical Cryogenic Thermometers with High Sensitivity: A Magnetic Circular Dichroism Based Thermometric Approach

“…To overcome these issues and open new avenues for temperature probing at low temperatures, we introduce a new concept based on magnetic circular dichroism (MCD) magneto‐optical thermometry. MCD spectroscopy is a technique that relies on the differential absorption ( ΔA ) of left and right circularly polarized light (lcp and rcp, respectively) components induced by a magnetic field oriented parallel (positive H ) or antiparallel (negative H ) to the direction of the light propagation [39–55] . The ΔA signal results from the Zeeman effect (magnetic perturbation) of the states involved in the optical transitions (Scheme 1).…”

“…MCD spectroscopy is a technique that relies on the differential absorption (ΔA) of left and right circularly polarized light (lcp and rcp, respectively) components induced by a magnetic field oriented parallel (positive H) or antiparallel (negative H) to the direction of the light propagation. [39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55] The ΔA signal results from the Zeeman effect (magnetic perturbation) of the states involved in the optical transitions (Scheme 1).…”