Abstract
The title compound, C18H24N4O6·0.075H2O, (I), was prepared as part of a research programme to prepare and identify new tripodal ligands which exhibit instability at low pH, thereby releasing coordinated metal cations under such conditions. Each molecule lies on a crystallographic threefold axis with the three arms arranged in the form of a claw. Angles within the five-membered succinimide ring, where the r.m.s. deviation of the five atoms from the least-squares ring plane is only 0.004 A, vary from 104.8 (3)° at a methylene C atom to 112.7 (3)° at the formally sp2 N atom. The structure contains a partially occupied disordered water molecule, the source of which is presumably the water produced as a by-product of the synthetic reaction.
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