Abstract
The synthesis and characterization of sodium 3,5-diacetyl-1,2,4-triazolate (4
Me
) and sodium 3,5-dibenzoyl-1,2,4-triazolate (4
Ph
), both of which can be used as head unit building blocks in Schiff-base reactions, are reported. The crystal structures of sodium 3,5-diacetyl-1,2,4-triazolate, as [4
Me
(H
2
O)]
∞
, and sodium 3,5-dibenzoyl-1,2,4-triazolate, as [4
Ph
(CH
3
OH)
2
]
2
, have been determined. The former is a helical polymer whilst the latter is a methanol-bridged dimer. The lead(II) templated cyclization reaction of sodium 3,5-dibenzoyl-1,2,4-triazolate (4
Ph
) with 1,3-diaminopropane or 1,4-diaminobutane, respectively, leads to the formation of two new [2 + 2] Schiff-base macrocycles as their lead(II) complexes, [Pb
2
L
3Ph
(μ-OH)]ClO
4
(5) and [Pb
2
L
4Ph
(μ-OH)]ClO
4
(6), respectively. Transmetallation of 5 with nickel(II) ions yields a novel, structurally characterized, dinickel(II) macrocyclic complex, [Ni
2
L
3Ph
(NCS)
2
] (7), which features double triazolate bridging of the two five-coordinate nickel(II) ions.