agosticadj.

Brit.

/əˈɡɒstɪk/, U.S.

/əˈɡɔstɪk/,

/əˈɡɑstɪk/

Origin: A borrowing from Greek, combined with an English element. Etymons: Greek ἀγοστεῖν , -ic suffix.

Etymology: < a supposed ancient Greek verb ἀγοστεῖν to clasp or hold to oneself (attributed to Homer) + -ic suffix (compare quot. 1983). In fact, ἀγοστῷ in Homer represents the dative of ἀγοστός flat of the hand, of unknown origin.

Chemistry.

Designating a kind of three-centre bonding between a central metal atom and a hydrogen atom which is bonded to a carbon atom in another part of the same molecule; of, relating to, or involving bonding of this kind.The C – H bond is part of a ligand already attached to the central atom or ion via another atom.

ΚΠ

1983 M. Brookhart & M. L. H. Green in Jrnl. Organometallic Chem. 250 395 We propose the term ‘agostic’ which will be used to discuss the various manifestations of covalent interactions between carbon-hydrogen groups and transition metal centres in organometallic compounds.

1993 Science 12 Mar. 1552/2 The observation of agostic metal alkyls in which C–H bonds interact with a metal center.

2011 P. M. B. Piccoli et al. in J. P. Fackler & L. R. Favello Techniques Inorg. Chem. iii. 66 The agostic bond is typically characterized by an elongation of the X-H distance, which is easily recognized by neutron diffraction.

This is a new entry (OED Third Edition, September 2012; most recently modified version published online December 2021).

单词	agostic
释义	agosticadj. Brit. /əˈɡɒstɪk/, U.S. /əˈɡɔstɪk/, /əˈɡɑstɪk/ Origin: A borrowing from Greek, combined with an English element. Etymons: Greek ἀγοστεῖν , -ic suffix. Etymology: < a supposed ancient Greek verb ἀγοστεῖν to clasp or hold to oneself (attributed to Homer) + -ic suffix (compare quot. 1983). In fact, ἀγοστῷ in Homer represents the dative of ἀγοστός flat of the hand, of unknown origin. Chemistry. Designating a kind of three-centre bonding between a central metal atom and a hydrogen atom which is bonded to a carbon atom in another part of the same molecule; of, relating to, or involving bonding of this kind.The C – H bond is part of a ligand already attached to the central atom or ion via another atom. ΚΠ 1983 M. Brookhart & M. L. H. Green in Jrnl. Organometallic Chem. 250 395 We propose the term ‘agostic’ which will be used to discuss the various manifestations of covalent interactions between carbon-hydrogen groups and transition metal centres in organometallic compounds. 1993 Science 12 Mar. 1552/2 The observation of agostic metal alkyls in which C–H bonds interact with a metal center. 2011 P. M. B. Piccoli et al. in J. P. Fackler & L. R. Favello Techniques Inorg. Chem. iii. 66 The agostic bond is typically characterized by an elongation of the X-H distance, which is easily recognized by neutron diffraction. This is a new entry (OED Third Edition, September 2012; most recently modified version published online December 2021). < adj.1983
随便看	heterousian heteroxanthin heteroxanthine heterozonal heterozooecial heterozooecium heterozooid heterozygoses heterozygosis heterozygosities heterozygosity heterozygote heterozygoted heterozygotes heterozygotic heterozygous heterœcismal hetest hethe hetheli leten hethely hethen hethen-forthward hethenforth hethenforthward