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1. Phenyl-Terminated Polyolefins via Living Coordinative Chain Transfer Polymerization with ZnPh ₂ as a Chain Transfer Agent

   https://doi.org/10.1021/acscatal.1c02038  

   Wallace, Mark A.; Burkey, Aaron A.; Sita, Lawrence R. (August 2021, ACS Catalysis)
2. Field tunable magnetic transitions of CsCo ₂ (MoO ₄ ) ₂ (OH): a triangular chain structure with a frustrated geometry

   https://doi.org/10.1039/d2qm01272c  

   Sanjeewa, Liurukara D.; Garlea, V. Ovidiu; Fishman, Randy S.; Foroughian, Mahsa; Yin, Li; Xing, Jie; Parker, David S.; Smith Pellizzeri, Tiffany M.; Sefat, Athena S.; Kolis, Joseph W. (March 2023, Materials Chemistry Frontiers)

   The sawtooth chain compound CsCo 2 (MoO 4 ) 2 (OH) is a complex magnetic system and here, we present a comprehensive series of magnetic and neutron scattering measurements to determine its magnetic phase diagram. The magnetic properties of CsCo 2 (MoO 4 ) 2 (OH) exhibit a strong coupling to the crystal lattice and its magnetic ground state can be easily manipulated by applied magnetic fields. There are two unique Co 2+ ions, base and vertex, with J bb and J bv magnetic exchange. The magnetism is highly anisotropic with the b -axis (chain) along the easy axis and the material orders antiferromagnetically at T N = 5 K. There are two successive metamagnetic transitions, the first at H c 1 = 0.2 kOe into a ferrimagnetic structure, and the other at H c 2 = 20 kOe to a ferromagnetic phase. Heat capacity measurements in various fields support the metamagnetic phase transformations, and the magnetic entropy value is intermediate between S = 3/2 and 1/2 states. The zero field antiferromagnetic phase contains vertex magnetic vectors (Co(1)) aligned parallel to the b -axis, while the base vectors (Co(2)) are canted by 34° and aligned in an opposite direction to the vertex vectors. The spins in parallel adjacent chains align in opposite directions, creating an overall antiferromagnetic structure. At a 3 kOe applied magnetic field, adjacent chains flip by 180° to generate a ferrimagnetic phase. An increase in field gradually induces the Co(1) moment to rotate along the b -axis and align in the same direction with Co(2) generating a ferromagnetic structure. The antiferromagnetic exchange parameters are calculated to be J bb = 0.028 meV and J bv = 0.13 meV, while the interchain exchange parameter is considerably weaker at J ch = (0.0047/ N ch ) meV. Our results demonstrate that the CsCo 2 (MoO 4 ) 2 (OH) is a promising candidate to study new physics associated with sawtooth chain magnetism and it encourages further theoretical studies as well as the synthesis of other sawtooth chain structures with different magnetic ions. 

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3. Electrically Driven Dynamics of Few‐Chain NbSe ₃

   https://doi.org/10.1002/pssb.201900241  

   Pham, Thang; Zettl, Alex (August 2019, physica status solidi (b))

   An in situ transmission electron microscopy study of few‐chain NbSe₃encapsulated within the hollow core of carbon nanotubes is presented, where the tube/chain system is subjected to applied axial electrical currents. Electromigration and thermal excitation forces result in collective and individual chain dynamics, with concomitant radial deformations of the encapsulating tubes. 

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4. Large magnetic anisotropy of a decorated spin-chain system K ₂ Co ₃ (MoO ₄ ) ₃ (OH) ₂

   https://doi.org/10.1039/D4DT00203B  

   Patel, Bhakti K; Ye, Feng; Liyanage, W_L_N C; Buchanan, C Charlotte; Gilbert, Dustin A; Kolis, Joseph W; Sanjeewa, Liurukara D (April 2024, Dalton Transactions)

   The paper presents the hydrothermal synthesis, magnetic properties, and magnetic structure characterization of K₂Co₃(MoO₄)₃(OH)₂half sawtooth chains. 

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5. Low-temperature heat transport of the zigzag spin-chain compound SrEr ₂ O ₄

   https://doi.org/10.1088/1674-1056/ac5e97  

   Chu, Liguo; Guang, Shuangkui; Zhou, Haidong; Zhu, Hong; Sun, Xuefeng (August 2022, Chinese Physics B)

   Low-temperature thermal conductivity ( κ ), as well as the magnetic properties and specific heat, are studied for the frustrated zigzag spin-chain material SrEr 2 O 4 by using single-crystal samples. The specific heat data indicate the long-range antiferromagnetic transition at ∼ 0.73 K and the existence of strong magnetic fluctuations. The magnetizations at very low temperatures for magnetic field along the c axis (spin chain direction) or the a axis reveal the field-induced magnetic transitions. The κ shows a strong dependence on magnetic field, applied along the c axis or the a axis, which is closely related to the magnetic transitions. Furthermore, high magnetic field induces a strong increase of κ . These results indicate that thermal conductivity along either the c axis or the a axis are mainly contributed by phonons, while magnetic excitations play a role of scattering phonons. 

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