Seven rings, eight-coordinated binuclear chelate: [Ca₂(SCZ)₄(NO₃)₂(H₂O)₂]Cl₂(SCZ = semicarbazide)

Abstract

An eight-coordinated nitrate alkaline-earth metal coordination compound [Ca2(SCZ)4(NO3)2(H2O)2]Cl2 was synthesized and characterized. Noticeably, SCZ (semicarbazide) presents typical bidentate coordination and unusual tridentate coordination modes.

Monoamide Derivatives of EDTA Incorporating Pendent Carboxylates or Pyridyls: Synthesis, Metal Binding, and Crystal Structure of a Dinuclear Ca2+ Complex Featuring Bridging Na+ Ions

“…The bond distances and bite angles (Table ) for the chelate rings in Ca 2 (AmGly 1 ) 2 are also comparable to those found in eight‐coordinate Ca 2+ complexes with similar donor sets . Furthermore, it can be seen that the pendent carboxylate group does not coordinate to either Ca 2+ ion in the dimer.…”

Innovative Concept of Designing Primary Explosives by IntroducingPolymers: Preparation and Investigation of {[Ca(CHZ)2](ClO4)2}n (CHZ = carbohydrazide)

“…In our previous work we paid much attention to azotic and oxygenic chain ligands such as carbohydrazide (CHZ) and semicarbazide (SCZ) because of their explosive performances and the chelating effect that enhances the molecular structural stability . According to the literature,, CHZ is a kind of azotic and oxygenic ligand with nitrogen‐ and oxygen‐atom lone electron pairs, which can serve as either monodentate or multidentate ligands while coordinating with central ions (Figure ). CHZ can react simultaneously with metal ions and oxidizing groups because of its strong reduction ability.…”

“…CHZ can react simultaneously with metal ions and oxidizing groups because of its strong reduction ability. Several metal carbohydrazido compounds,, , such as cadmium tri(carbohydrazide) perchlorate and zinc tri(carbohydrazide) perchlorate, have been successfully prepared and proved to be remarkable in practical applications. At the same time, researchers have also paid attention to energetic materials based on alkaline‐earth metals.…”