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In the title hydrated mol-ecular salt, [Cu(C 7 H 20 N 4 )(H 2 O) 2 ](C 8 H 4 O 4 )·H 2 O, the metal ion is coordinated by the two primary and two secondary N atoms of the amine ligand and the mutually trans O atoms of the water mol-ecules in a tetra-gonally distorted octa-hedral geometry. The average equatorial Cu-N bond lengths (2.013 and 2.026 Å for Cu-N prim and Cu-N sec , respectively) are substanti-ally shorter than the average axial Cu-O bond length (2.518 Å). The tetra-amine ligand adopts its energetically favored conformation with its five- and six-membered chelate rings in gauche and chair conformations, respectively. In the crystal, the N-H donor groups of the tetra-amine, the acceptor carboxyl-ate groups of the isophthalate dianion and both the coordinated water mol-ecules and the water mol-ecule of crystallization are involved in numerous N-H⋯O and O-H⋯O hydrogen bonds, resulting in the formation of electroneutral layers oriented parallel to the ac plane., (© Tsymbal et al. 2022.)

The asymmetric unit of the title compound, trans -di-aqua-(1,4,8,11-tetra-aza-undecane-κ 4 N 1 , N 4 , N 8 , N 11 )nickel(II) bis-(pyridine-2,6-di-carboxyl-ato-κ 3 O 2 , N , O 6 )nickel(II) {[Ni( L )(H 2 O) 2 ][Ni(pdc) 2 ] where L = 1,4,8,11-tetra-aza-undecane (C 7 H 20 N 4 ) and pdc = the dianion of pyridine-2,6-di-carb-oxy-lic acid (C 7 H 3 NO 4 2- )} consists of an [Ni( L )(H 2 O) 2 ] 2+ complex cation and a [Ni(pdc) 2 ] 2- anion. The metal ion in the cation is coordinated by the four N atoms of the tetra-amine ligand and the mutually trans O atoms of the water mol-ecules in a tetra-gonally elongated octa-hedral geometry with the average equatorial Ni-N bond length slightly shorter than the average axial Ni-O bond [2.087 (4) versus 2.128 (4) Å]. The ligand L adopts its energetically favored conformation with five-membered and six-membered chelate rings in gauche and chair conformations, respectively. In the complex anion, the Ni II ion is coordinated by the two tridentate pdc 2- ligands via their carboxyl-ate and nitro-gen atom donors in a distorted octa-hedral trans -NiO 4 N 2 geometry with nearly orthogonal orientation of the planes defining the carboxyl-ate rings and the average Ni-N bond length [1.965 (4) Å] shorter than the average Ni-O bond distance [2.113 (7) Å]. In the crystal, the NH donor groups of the tetra-amine, the carb-oxy-lic groups of the pdc 2- anion and the coordinated water mol-ecules are involved in numerous N-H⋯O and O-H⋯O hydrogen bonds, leading to electroneutral sheets oriented parallel to the (001) plane., (© Andriichuk et al. 2021.)

The asymmetric unit of the title com-pound, catena -poly[[[(perchlorato-κ O )copper(II)]-μ-3-(3-carb-oxy-prop-yl)-1,5,8,12-tetra-aza-3-azonia-cyclo-tetra-decane-κ 4 N 1 , N 5 , N 8 , N 12 ] bis-(per-chlorate)], {[Cu(C 13 H 30 N 5 O 2 )(ClO 4 )](ClO 4 ) 2 } n , (I), consists of a macrocyclic cation, one coordinated per-chlorate anion and two per-chlorate ions as counter-anions. The metal ion is coordinated in a tetra-gonally distorted octa-hedral geometry by the four secondary N atoms of the macrocyclic ligand, the mutually trans O atoms of the per-chlorate anion and the carbonyl O atom of the protonated carb-oxy-lic acid group of a neighbouring cation. The average equatorial Cu-N bond lengths [2.01 (6) Å] are significantly shorter than the axial Cu-O bond lengths [2.379 (8) Å for carboxyl-ate and average 2.62 (7) Å for disordered per-chlorate]. The coordinated macrocyclic ligand in (I) adopts the most energetically favourable trans -III conformation with an equatorial orientation of the substituent at the protonated distal 3-position N atom in a six-membered chelate ring. The coordination of the carb-oxy-lic acid group of the cation to a neighbouring com-plex unit results in the formation of infinite chains running along the b -axis direction, which are cross-linked by N-H⋯O hydrogen bonds between the secondary amine groups of the macrocycle and O atoms of the per-chlorate counter-anions to form sheets lying parallel to the (001) plane. Additionally, the extended structure of (I) is consolidated by numerous intra- and interchain C-H⋯O contacts., (© Tsymbal et al. 2019.)

The asymmetric units of the title compounds, trans -di-aqua-(3-benzyl-1,3,5,8,12-penta-aza-cyclo-tetra-decane-κ 4 N 1 , N 5 , N 8 , N 12 )copper(II) isophthalate monohydrate, [Cu(C 16 H 29 N 5 )(H 2 O) 2 ](C 8 H 4 O 4 )·H 2 O, (I), and trans -di-aqua-[3-(pyridin-3-ylmeth-yl)-1,3,5,8,12-penta-aza-cyclo-tetra-decane-κ 4 N 1 , N 5 , N 8 , N 12 ]copper(II) iso-phthalate 0.9-hydrate, [Cu(C 15 H 28 N 6 )(H 2 O) 2 ](C 8 H 4 O 4 )·0.9H 2 O, (II) consist of one di-aqua macrocyclic cation, one di-carboxyl-ate anion and uncoordinated water mol-ecule(s). In each compound, the metal ion is coordinated by the four secondary N atoms of the macrocyclic ligand and the mutually trans O atoms of the water mol-ecules in a tetra-gonally distorted octa-hedral geometry. The average equatorial Cu-N bond lengths are significantly shorter than the average axial Cu-O bond lengths [2.020 (9) versus 2.495 (12) Å and 2.015 (4) versus 2.507 (7) Å for (I) and (II), respectively]. The coordinated macrocyclic ligand in the cations of both compounds adopts the most energetically favorable trans -III conformation. In the crystals, the complex cations and counter-anions are connected via hydrogen-bonding inter-actions between the N-H groups of the macrocycles and the O-H groups of coordinated water mol-ecules as the proton donors and the O atoms of the carboxyl-ate as the proton acceptors. Additionally, as a result of O-H⋯O hydrogen bonding with the coordinated and water mol-ecules of crystallization, the isophthalate dianions form layers lying parallel to the (01) and (100) planes in (I) and (II), respectively.

The asymmetric unit of the title compound, trans -di-aqua-(3,10-dimethyl-1,3,5,8,10,12-hexa-aza-cyclo-tetra-decane-κ 4 N 1 , N 5 , N 8 , N 12 )copper(II) 4,4'-methyl-ene-bis(3-hy-droxy-naphthalene-2-carboxyl-ate), [Cu(C 10 H 26 N 6 )(H 2 O) 2 ](C 23 H 14 O 6 ) {[Cu( L )(H 2 O) 2 ](pam), where L = 3,10-dimethyl-1,3,5,8,10,12-hexa-aza-cyclo-tetra-decane and pam = dianion of pamoic acid} consists of two independent halves of the [Cu( L )(H 2 O) 2 ] 2+ cation and one di-carboxyl-ate anion. The Cu II atoms, lying on inversion centres, are coordinated by the four secondary N atoms of the macrocyclic ligands and the mutually trans O atoms of the water mol-ecules in a tetra-gonally elongated octa-hedral geometry. The average equatorial Cu-N bond length is significantly shorter than the average axial Cu-O bond length [2.007 (10) and 2.486 (18) Å, respectively]. The macrocyclic ligand in the complex cations adopts the most energetically stable trans -III conformation. The complex cations and anions are connected via hydrogen-bonding inter-actions between the N-H groups of the macrocycles and the O-H groups of coordinated water mol-ecules as the proton donors and the O atoms of the carboxyl-ate as the proton acceptors into layers lying parallel to the (11) plane.