Şebnem Esen SÖZERLİ, Arzu ÖZEN, İbrahim KANİ, Deniz DEMİR

Synthesis and characterization of a novel 3-amino-1,2,4-triazole lead(II) coordination polymer

A novel [Pb2(m-atrz)2(m-CH3COO)(CH3COO)]n (atrz = 3-amino-1,2,4-triazole) complex was synthesized and characterized by IR spectroscopy, thermogravimetric analysis, and single crystal X-ray diffraction. The molecular structure shows that the complex is a coordination polymer in which there are 2 different lead(II) ions with coordination number of 5, Pb(2), and, with a coordination number of 4, Pb(1). Each atrz acts as a bridging ligand between 2 Pb(II) ions through the 2 adjacent nitrogen atoms of the triazole ring. The acetate anions show different types of coordination mode: one acts as a bridge by coordination of the same oxygen atom with Pb(II) ions and the other as a monodentate coordination by one of the oxygen atoms with Pb(2).

Anahtar Kelimeler:

3-Amino-1, 2, 4-triazole, 1, 2, 4-triazole, acetate, lead(II) complexes, coordination polymer

Synthesis and characterization of a novel 3-amino-1,2,4-triazole lead(II) coordination polymer

Keywords:

3-Amino-1, 2, 4-triazole, 1, 2, 4-triazole, acetate, lead(II) complexes, coordination polymer,

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Experimental
General procedures
3-Amino-1,2,4-triazole and lead(II) acetate trihydrate were purchased from Sigma-Aldrich Co.; sodium nitrite was purchased from Carlo Erba. All chemicals and reagents were used as received without any purification.
IR spectra were recorded as KBr pellets using a PerkinElmer LR 64912C in the frequency range 4000−400 cm −1
Thermogravimetric analysis was performed on a PerkinElmer Diamond TG/DTA by heating the sample at a rate of 20 ◦
C/min under flowing nitrogen. Melting point was measured on an Electrothermal 9100 apparatus and was uncorrected.
X-ray crystallography
Preparation of [Pb2( µ -atrz)2( µ -CH3COO)(CH3COO)]n
) selected bands: 443 vs, 470 m , 665 vs, 837 s , 1064 s , 1177 m , 1268 s , 1434 vs, 1497 ms, 1526 s , 1549 ms, 1627 vs, 2955 w , 3137 w , 3186 w , 3294 w , 3356 s .
Supplementary data: Crystallographic data can be obtained from the Cambridge Crystallographic Data Center, by quoting the reference number CCDC-928602. The data can be obtained free of charge at www.ccdc.cam.ac.uk/data request/cif.