Abstract
The phosphonic acid 1,3,5-benzenetri(phosphonic acid) (BTP; 1,3,5-[(OH)2PO]3-C6H3) can act as both a hydrogen bond donor and acceptor. BTP was reacted with two organic bases, 2,2‘-bipyridine and 4,4‘-bipyridine, in a 1:1 molar ratio. The bis-deprotonation and tris-deprotonation trigger the formation of self-complementary 3D hydrogen bonding architectures. Layers of the 2,2‘-bipyridine compound are formed through hydrogen bonding of the phosphonic acid groups existing in the dianionic motif {1,3-[(OH)PO2]2-5-[PO(OH)2]-C6H3}2-. The ratio of BTP to 2,2‘-bipyridine is 1:1.5, with two of the phosphonic acid protons being transferred to the nitrogen atoms, leaving a negatively charged oxygen and a proton on each of the phosphonic acid groups. Discrete dimers are formed by three very short PO−H···O−P type hydrogen bonds (2.45−2.48 A) and one short PO−H···OP hydrogen bond at 2.56 A interconnecting all dimers into extended layers in the bc plane. The protonated bipyridyls penetrated into the layers by formation of...
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