Supramolecular architecture of diammonium ferrocene-1,1′-diyldiphosphinates

Influence of the Substituent’s Size in the Phosphinate Group on the Conformational Possibilities of Ferrocenylbisphosphinic Acids in the Design of Coordination Polymers and Metal–Organic Frameworks

“…In the case of ammonium salts [ 47 , 48 ], the formation of supramolecular coordination structures due to the formation of hydrogen bonds between ammonium and phosphinates was observed ( Scheme 3 ). These systems are promising to study as highly soluble candidates for ARFB (aqueous redox flow battery) applications [ 49 ].…”

“…Starting materials 1,1′-ferrocenylenbis( H -phosphinic) acid 1 (H 2 fcd H p), 1,1′-ferrocenylenbis(metylphosphinic) acid 2 (H 2 fcd Me p), 1,1′-ferrocenylenbis(phenylphosphinic) acid 3 (H 2 fcd Ph p) were prepared according to procedure mentioned in the literature [ 46 ]. Their derivatives 1a and 3a [ 47 ], 2a [ 48 ], 4a and 4b [ 51 ], 5a [ 54 ], 5c [ 54 ], 7 [ 54 , 58 ], 8a – d [ 54 ] , 9a , b [ 63 ], and Al or Fe aerogels [ 58 , 59 ] were prepared according to procedures mentioned in the literature. All the other chemicals and solvents in the synthesis were reagent grade and used as received.…”

Ferrocene and Transition Metal Bis(Dicarbollides) as Platform for Design of Rotatory Molecular Switches

“…For example, the transoid conformation was found in the solid state for ferrocene-1,1′-diyl bis(methylphosphinic) acid (η 5 -C 5 H 4 P(O)(Me)OH) 2 Fe, whereas in the cases of ferrocene-1,1′-diyl bis(ethylphosphinic) (η 5 -C 5 H 4 P(O)(Et)OH) 2 Fe and ferrocene-1,1′-diyl bis(phenylphosphinic) (η 5 -C 5 H 4 P(O)(Ph)OH) 2 Fe acids the expected cis -conformation is realized ( Figure 1 ) [ 26 ]. The conformation in the diammonium salts of ferrocene-1,1′-diyl bis(phosphinic) and ferrocene-1,1′-diyl bis(phenylphosphinic) acids is determined by the interactions of the substituents with ammonium cations in the crystal lattice, where the respective rotation angles of ~120° and ~90° were found ( Figure 2 ) [ 27 ].…”

“… X-ray crystal structures of diammonium ferrocene-1,1′-diyl bis(phosphinate) ( a ) and diammonium ferrocene-1,1′-diyl bis(phenylphosphinate) ( b ). Reprinted with permission from [ 27 ]. Copyright (2014) Springer Science (Berlin, Germany).…”

Reversible Water-Induced Structural and Magnetic Transformations and Selective Water Adsorption Properties of Poly(manganese 1,1′-ferrocenediyl-bis(H-phosphinate))

“…Combining lability of phosphinate or phosphonate groups with a three-dimensional (3D) rigid fragment such as ferrocene, one can expect the formation of flexible and dynamic frameworks of the third generation. The ability of phosphinate and phosphonate groups to act as strong hydrogen bond acceptors can enhance the stability of the MOF and be crucial for its dynamic properties. The structural studies of coordination properties of phosphorus containing acids revealed their ability to bridge metals forming M–O–P–O–M stable fragments .…”