prov:value
| - Zd wherein R represents C1-8alkyl, aryl, alkaryl, C3-20alkyl carboxylates and esters, alkyl or aryl or alkaryl mercaptides, glycolates and chelates, E is a metal or metalloid element from periodic groups 4 and 14, X, Y and Z represent halogen atoms hydrogen, alkoxides, amine or an organometallic group groups, the subscript a is 2 or 3, the value of b, c, and d can each independently range from 0-3
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