Singlet ground state, magnetic

HoBa2Cu 02. By now it is clear that praseodymium is the rare earth most likely to be involved in singlet ground state magnetism, and that pSR can be difficult to understand in that case. The other integer-spin trivalent rare earths... 

Like TME, the diradical 15 was shown to have nearly degenerate singlet and triplet states by magnetic susceptibility [60, 61], although the early works by Dowd identified a triplet ground state on the basis of ESR spectrum [62, 63], The UCCSD(T) calculations predicted a singlet ground state with a small S-T gap of... 

The structurally similar, but magnetically distinct, lanthanide(III) texaphyrin complexes, MLu and MGd both generate reactive oxygen species (ROS), albeit via different mechanisms. Photoirradiation of MLu causes excitation from the singlet ground state to the triplet state (Fig. 3). 

While the singlet ground state will be unaffected by an external magnetic field, the S 1 state will become Zeeman split into the Ms =—1,0, 1 sublevels. Thus, the energies of the four possible 15, Ms) states are known (10, 0)) = Jex (ll, + 1)) = —g/rB77 (ll, 0)) = 0 (ll, —1))= I /ab//. When these four expressions are introduced into the Van Vleck equation, the Bleaney-Bowers equation7 is obtained. This equation describes the temperature dependence of the susceptibility (for the zero-field limit), independent of the sign of Jcx ... 

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