A unique dysprosium selenoarsenate(iii) exhibiting a photocurrent response and slow magnetic relaxation behavior.

A redox, substitution and self-assembly reaction offers a novel dysprosium selenoarsenate(iii) with As3+ [Dy2 (tepa)2 (μ2 -OH)2 Cl2 ]3 [As3 Se6 ]2 (1, tepa = tetraethylenepentamine), which provides the first example of chair conformation ring [As3 Se6 ]3- combined with lanthanide complexes as counterions. 1 exhibits a photocurrent response and slow magnetic relaxation behavior.