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Binary [Hydrotris(1,2,4‐triazolyl)borate]metal Complexes [M{HB(C 2 H 2 N 3 ) 3 } 2 ] with M = Fe, Co, Cu, Zn: Synthesis, Characterization, Magnetochemistry, and X‐ray Structure of [Cu{HB(C 2 H 2 N 3 ) 3 } 2 ·4CH 3
Author(s) -
Janiak Christoph
Publication year - 1994
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19941270809
Subject(s) - chemistry , crystallography , monoclinic crystal system , ligand (biochemistry) , orthorhombic crystal system , paramagnetism , spin crossover , molecule , pentagonal bipyramidal molecular geometry , crystal structure , biochemistry , physics , receptor , organic chemistry , quantum mechanics
The bis[hydrotris(1,2,4‐triazolyl)borate]metal complexes [M{HB(C 2 H 2 N 3 ) 3 } 2 ] with M = Fe ( 5 ), Co ( 6 ), Cu ( 7 ), Zn ( 8 ) are obtained from MX 2 and K[HB(C 2 H 2 N 3 ) 3 ] ( 9 ). The complexes are characterized by IR, UV/Vis, and MS. Temperature‐variable magnetic measurements show a Curie‐Weiss behavior for the paramagnetic complexes 6 and 7 with a temperature‐dependent magnetic moment for 6 . The iron complex 5 exhibits a spin crossover from diamagnetic to paramagnetic, starting at around 270 K. Single‐crystal X‐ray structures of the solvates 7 · 4 CH 3 OH and 9 · 2 H 2 O have been determined. The structure of 7 · 4 CH 3 OH shows the Jahn‐Teller distorted copper complex 7 surrounded by methanol molecules through hydrogen bonding to exocyclic nitrogen atoms of the tris(1,2,4‐triazolyl)borate ligand. The crystal system for 7 · 4 CH 3 OH is monoclinic, space group P 2 1 / n. Compound 9 · 2 H 2 O is a one‐dimensional coordination polymer with the potassium atom bridged by the water molecules and the tris(1,2,4‐triazolyl)borate ligand and crystallizes in the orthorhombic space group Ccm 2 1 .