“…Analytical data are in agreement with the polymeric formulae [Ca(tda)-(H 2 O)] n and [Sr(tda)] n , respectively. This composition is distinct from that found for its lighter group II homologous, [1a,7], Cd [8]), which were all isostructural. Surprisingly, in spite of the similar composition, the IR spectrum of 1 does not match the characteristic IR fingerprint of the mentioned [M(tda)(H 2 O)] n compounds (see Supplementary material), thus suggesting a different structure.…”