Similarly, interaction of TPPO with GaLA results in the formation of an adduct (TPPO/GaLA, Figure ) analogous to 1-TPPO with calculated NMR parameters -δiso/CQequal to 113 ppm/23 MHz, which represents a significantly lower CQ than GaLA. In constrast to Py, interaction of TPPO with GaBA only results in the the formation of an H-bonded TPPO, with Ga-(μ-O(H))-Si core (TPPO/GaBA, Figure ), for which the calculated δiso/CQ are 128 ppm/23 MHz. The calculated δiso for TPPO/GaLA and TPPO/GaBA differs by a comparable amount (Δδiso = 16 ppm) to the py adducts. In contrast to py, however, TPPO/GaLA and TPPO/GaBA are not expected to be distinguishable on the basis of CQ.