Complexes of 2,2′,2″‐Nitrilotriphenol. Part 2. Crystal and Molecular Structures of Three Boron Complexes | Zendy

Müller Edgar | Zendy; Bürgi HansBeat | Zendy

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Complexes of 2,2′,2″‐Nitrilotriphenol. Part 2. Crystal and Molecular Structures of Three Boron Complexes

Author(s) -

Müller Edgar,

Bürgi HansBeat

Publication year - 1987

Publication title -

helvetica chimica acta

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.74

H-Index - 82

eISSN - 1522-2675

pISSN - 0018-019X

DOI - 10.1002/hlca.19870700304

Subject(s) - chemistry , quinuclidine , pyridine , crystal structure , boron , crystallography , adduct , stereochemistry , molecule , coordination sphere , acceptor , ligand (biochemistry) , nucleophile , medicinal chemistry , organic chemistry , catalysis , biochemistry , physics , receptor , condensed matter physics

Crystal and molecular structures of a complex between B ( III ) and the tripod ligand 2,2′,2″‐nitrilotriphenol as well as of its pyridine and quinuclidine adducts are presented. The 2,2′,2″‐nitrilotriphenyl borate ( III ) molecule shows a strained, tricyclic chelate system with a central N–B donor‐acceptor bond of 1.681(5) Å. In the adducts with pyridine ( IV ) and quinuclidine ( III ‐quin), this bond is broken, the N‐atom inverts and is pushed out of the coordination sphere ( B–N intern = 2.82 Å for Py and 2.85 Å for quin), and a new bond is formed between the boron atom and the external nucleophile ( B–N extern = 1.631 Å for Py and 1.643 Å for quin).

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