Synthesis and crystal and molecular structure of a tetranuclear cluster based on the rhenium(III)-bisorganohydrazino core: [Re(HNNC4H3N2)(NNC4H3N2)(OCH3)2]4

Syntheses and properties of Re(III) complexes derived from hydrotris(1-pyrazolyl)methanes: molecular structure of [ReCl2(HCpz3)(PPh3)][BF4]

“…Hence, the benzoyldiazenide ligand acts as a 3-electron donor (if considered in the neutral form a) or as a 4-electron donor (negatively charged form) [26], thus giving an 18-electron configuration to the complex. A similar coordination mode is known for a variety of organodiazenide rhenium complexes [11c, [27][28][29][30]. The average Re-Cl bond distance in compound 1 [2.4208 (19) Å ] is longer than that found in complex 3 (9) Bond angles Cl(1)-Re-Cl (2) 88.31 (6) Cl (1)-Re-Cl (2) 92.52 (14) Cl(1)-Re-P(1) 90.29 (5) Cl (1)-Re-P(1) 97.21(15) Cl(1)-Re-P (2) 89.45 (5) Cl (1) There is an intramolecular H bond N12-H12Á Á ÁO1 (H12Á Á ÁO1, 1.938 Å ) in 1 which implies the coplanarity of both the pyrazolyl and the organodiazenide groups.…”

Syntheses and structural characterization of rhenium-bis-hydrazinopyrimidine core complexes with thiolate and Schiff base coligands

“…However, attempts to recrystallize 1 from DMF-MeOH resulted in the isolation of the tetranuclear cluster [Re(η 1 -NNC 4 H 3 N 2 )(η 2 -HNNC 4 H 3 N 2 )(OCH 3 ) 2 ] 4 [12]. In an attempt to provide a structurally characterized example of the metal-bispyrimidinohydrazine core, the red, diamagnetic complex [MoCl 3 (η 1 -NNC 4 H 3 N 2 H)(η 2 -HNNHC 4 H 3 N 2 )] (1a) was prepared.…”

“…In an effort to expand this approach to the radio-labeling of proteins and peptides, we have begun to develop the parallel chemistry of hydrazinopyrimidine as the potential structural core for a bifunctional linker group [12]. While the chemistry of 2-hydrazinopyrimidine is often analogous to that of 2-hydrazinopyridine, it does offer some advantages in terms of solubility and derivatization.…”