Superparamagnetic behavior in a molecular aggregate is reported here for the first time. Mesoporous niobium oxide loaded with increasing levels of cobaltocene contains varying ratios of CoII to CoIII (see Figure). A subtle increase is seen to lead to a dramatic change in the magnetic properties—from paramagnetic to superparamagnetic, which makes the composites potentially useful in sensor technology.
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Murray et al. (2000) studied this question.