“…Hans-Joachim Lunk was a Professor at the Humbolt-Univerität zu Berlin and is currently at Osram Sylvania, Inc. in Towanda, PA. Much of Lunk's early work in heteropoly chemistry involved the study of the thermal degradation of heteropoly acids by means of X-ray heating patterns, thermal analysis, IR spectroscopy, and solid-state NMR spectroscopy to study the new phases formed. ,− Many of the new Keggin heteropoly complexes synthesized and characterized by Lunk and co-workers involved Ge 4+ , Al 3+ , Fe 3+ , and Cu 2+ in tetrahedral coordination. − For example: the characterization and thermal behavior of α-H 4 [GeO 4 W 12 O 36 ]·24H 2 O, the preparation of H 5 [AlO 4 W 12 O 36 ]·6H 2 O, the synthesis, characterization, and ESR studies of anions containing Fe 3+ in both tetrahedral and octahedral sites, Mössbauer studies of heteropoly acids with Fe 3+ heteroatoms, and synthesis and structure studies of Ba 2 H[α-FeO 4 W 12 O 36 ]·26H 2 O. , The crystal structure, NMR and ESR spectra of the first Keggin complex with Cu 2+ in a tetrahedral site was reported by Lunk and co-workers. , …”