Synthesis, structure, and properties of Li2Pb2CuB4O10 with isolated [CuB4O10]6− units

The copper borate Li 2 Pb 2 CuB 4 O 10 has been synthesized in air by the standard solid-state reaction at temperature in the range 550–650 °C and the structure of Li 2 Pb 2 CuB 4 O 10 was determined by single-crystal X-ray diffraction. Li 2 Pb 2 CuB 4 O 10 crystallizes in the monoclinic space group C 2/ c (no. 15) with a = 16.8419(12), b = 4.7895(4), c = 13.8976(10) A, and β = 125.3620(10)°, V = 914.22(12) A 3 , and Z = 4, as determined by single-crystal X-ray diffraction. The Li 2 Pb 2 CuB 4 O 10 structure exhibits isolated units of stoichiometry [CuB 4 O 10 ] 6− that are built from CuO 4 distorted square planes and triangular BO 3 groups. The IR spectroscopy and thermal analysis investigations of Li 2 Pb 2 CuB 4 O 10 are also presented.