The nature and the variation of Ge–O bonding in germanates

✍ Scribed by Nishi, Fumito; Takéuchi, Yoshio

• Book ID: 118013408
• Publisher: Oldenbourg Wissenschaftsverlag
• Year: 1992
• Tongue: English
• Weight: 693 KB
• Volume: 202
• Category: Article
• ISSN: 2194-4946
• DOI: 10.1524/zkri.1992.202.3-4.251

✦ Synopsis

Abstract

A survey of 42 germanates has revealed that the bond lengths of the GeO~4~ groups linearly decrease with increasing the Ge–O–Ge angles on account of the increase of π-bond character between Ge and O atoms. The amount of π-bond character which gives rise to the Ge–O bond shortening is influenced not only by the Ge–O–Ge angles but also the average electronegativity of all the cations contained. In a diagram showing the amount of π-bond character versus bond shortening, entries for the TO~4~ groups with T belonging to the third row of the periodic table (e.g. Al and Si etc.) closely lie in a line, while those with T belonging to the fourth row (e.g. Ga and Ge etc.) in another line. This situation suggests that the amount of π-bond character basically depends on the electron configuration of T atoms.