20781
Nanoparticles of a three - dimensional coordination polymer , [ Pb ( L ) ( mu 2 - Br ) ( H2O ) ] n ( 1 ) , ( L ( - ) = 1H - 1 , 2 , 4 - triazole - 3 - carboxylate ) , have been synthesized by an ultrasonic method and characterized by scanning electron microscopy , X - ray powder diffraction , IR spectroscopy and elemental analyses .
 Chemical: [ Pb ( L ) ( mu 2 - Br ) ( H2O ) ] n; Chemical: 1H - 1 , 2 , 4 - triazole - 3 - carboxylate
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: [ Pb ( L ) ( mu 2 - Br ) ( H2O ) ] n; Chemical: 1H - 1 , 2 , 4 - triazole - 3 - carboxylate