“…The pentametalate unit composed of molybdenum atoms and capped with phosphate-based heterogroups {P 2 Mo 5 O 23 }, is also referenced to as the Strandberg ion. Almost all the reports of the pentametalate ion derivatives are with high oxidation-state metals, predominantly with molybdenum, 41–58 and very few with tungsten. 59–61 Some of the elements constituting the hetero-group within the pentametalate ion include phosphorus, 41–51 sulphur, 52,53 arsenic, 54,55 and selenium, 56–58 with molybdo-phosphate derivatives, i.e.…”