The coordination of the modified poly(azolyl)borato ligand hydrotris (1,2,4-triazolyl)borato (L) with main group metals leads to complexes with coordination numbers of eight and the formula [CaL 2 (H 2 O) 2 ], [SrL 2 (H 2 O) 2 ], and [PbL 2 (H 2 O) 2 ]. The two L ligands coordinate in a ªbentº arrangement to allow for the coordination of the two aqua ligands. This is in sharp contrast to six-coordinated, pseudooctahedral CaTp 2 and PbTp 2 complexes [Tp = hydrotris(pyrazolyl)borato]. The calcium, strontium, and lead complexes are isostructural. No stereochemical lone pair activity is evident in [PbL 2 (H 2 O) 2 ]. Two additional water molecules of crystallization complete the crystal structure of [CaL 2 (H 2 O) 2 ]2 H 2 O and [PbL 2 (H 2 O) 2 ]´2 H 2 O. In the synthesis of [PbL 2 (H 2 O) 2 ] an intermediate of the form 2 I [Pb(l 3 -L)(NO 3 )H 2 O] could isolated and structurally characterized.There, the lead(II) center is seven coordinated with a presumably stereochemically active lone pair. Long M±L bonds argue for a more ionic bonding to the modified tris(triazolyl)borato ligand when compared to analogous M±Tp complexes.
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