19993
Six new platinum ( II ) complexes with mono - aminophosphonate ester were synthesized and characterized by elemental analysis , ( 1 ) H NMR , ESI - MS as well as single crystal X - ray diffraction analysis .
 Chemical: platinum ( II ); Chemical: mono - aminophosphonate ester; Chemical: ( 1 ) H
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: platinum ( II ); Chemical: mono - aminophosphonate ester; Chemical: ( 1 ) H